The Collaborative International Dictionary of English v.0.48:

Pipe \Pipe\, n. [AS. p[imac]pe, probably fr. L. pipare, pipire,
   to chirp; of imitative origin. Cf. Peep, Pibroch,
   Fife.]
   1. A wind instrument of music, consisting of a tube or tubes
      of straw, reed, wood, or metal; any tube which produces
      musical sounds; as, a shepherd's pipe; the pipe of an
      organ. "Tunable as sylvan pipe." --Milton.
      [1913 Webster]

            Now had he rather hear the tabor and the pipe.
                                                  --Shak.
      [1913 Webster]

   2. Any long tube or hollow body of wood, metal, earthenware,
      or the like: especially, one used as a conductor of water,
      steam, gas, etc.
      [1913 Webster]

   3. A small bowl with a hollow stem, -- used in smoking
      tobacco, and, sometimes, other substances.
      [1913 Webster]

   4. A passageway for the air in speaking and breathing; the
      windpipe, or one of its divisions.
      [1913 Webster]

   5. The key or sound of the voice. [R.] --Shak.
      [1913 Webster]

   6. The peeping whistle, call, or note of a bird.
      [1913 Webster]

            The earliest pipe of half-awakened birds.
                                                  --Tennyson.
      [1913 Webster]

   7. pl. The bagpipe; as, the pipes of Lucknow.
      [1913 Webster]

   8. (Mining) An elongated body or vein of ore.
      [1913 Webster]

   9. A roll formerly used in the English exchequer, otherwise
      called the Great Roll, on which were taken down the
      accounts of debts to the king; -- so called because put
      together like a pipe. --Mozley & W.
      [1913 Webster]

   10. (Naut.) A boatswain's whistle, used to call the crew to
       their duties; also, the sound of it.
       [1913 Webster]

   11. [Cf. F. pipe, fr. pipe a wind instrument, a tube, fr. L.
       pipare to chirp. See Etymol. above.] A cask usually
       containing two hogsheads, or 126 wine gallons; also, the
       quantity which it contains.
       [1913 Webster]

   Pipe fitter, one who fits pipes together, or applies pipes,
      as to an engine or a building.

   Pipe fitting, a piece, as a coupling, an elbow, a valve,
      etc., used for connecting lengths of pipe or as accessory
      to a pipe.

   Pipe office, an ancient office in the Court of Exchequer,
      in which the clerk of the pipe made out leases of crown
      lands, accounts of cheriffs, etc. [Eng.]

   Pipe tree (Bot.), the lilac and the mock orange; -- so
      called because their were formerly used to make pipe
      stems; -- called also pipe privet.

   Pipe wrench, or Pipe tongs, a jawed tool for gripping a
      pipe, in turning or holding it.

   To smoke the pipe of peace, to smoke from the same pipe in
      token of amity or preparatory to making a treaty of peace,
      -- a custom of the American Indians.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pipe \Pipe\, v. t. [imp. & p. p. Piped; p. pr. & vb. n.
   Piping.]
   1. To perform, as a tune, by playing on a pipe, flute, fife,
      etc.; to utter in the shrill tone of a pipe.
      [1913 Webster]

            A robin . . . was piping a few querulous notes. --W.
                                                  Irving.
      [1913 Webster]

   2. (Naut.) To call or direct, as a crew, by the boatswain's
      whistle.
      [1913 Webster]

            As fine a ship's company as was ever piped aloft.
                                                  --Marryat.
      [1913 Webster]

   3. To furnish or equip with pipes; as, to pipe an engine, or
      a building.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pipe \Pipe\, v. i.
   1. To play on a pipe, fife, flute, or other tubular wind
      instrument of music.
      [1913 Webster]

            We have piped unto you, and ye have not danced.
                                                  --Matt. xi.
                                                  17.
      [1913 Webster]

   2. (Naut.) To call, convey orders, etc., by means of signals
      on a pipe or whistle carried by a boatswain.
      [1913 Webster]

   3. To emit or have a shrill sound like that of a pipe; to
      whistle. "Oft in the piping shrouds." --Wordsworth.
      [1913 Webster]

   4. (Metal.) To become hollow in the process of solodifying;
      -- said of an ingot, as of steel.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pipe
    n 1: a tube with a small bowl at one end; used for smoking
         tobacco [syn: pipe, tobacco pipe]
    2: a long tube made of metal or plastic that is used to carry
       water or oil or gas etc. [syn: pipe, pipage, piping]
    3: a hollow cylindrical shape [syn: pipe, tube]
    4: a tubular wind instrument
    5: the flues and stops on a pipe organ [syn: organ pipe,
       pipe, pipework]
    v 1: utter a shrill cry [syn: shriek, shrill, pipe up,
         pipe]
    2: transport by pipeline; "pipe oil, water, and gas into the
       desert"
    3: play on a pipe; "pipe a tune"
    4: trim with piping; "pipe the skirt"

Moby Thesaurus II by Grady Ward, 1.0:

319 Moby Thesaurus words for "pipe":
   English horn, Missouri meerschaum, Pandean pipe, adjutage,
   aerophone, anthem, aulos, bagpipe, ballad, bark, barrel,
   basset horn, basset oboe, bassoon, bawl, bay, beep, bell, bellow,
   blare, blast, blat, blow, blow a horn, blow the horn, blubber,
   bole, bombard, bong, boohoo, boom, brass, bray, breathe, briar,
   briar pipe, bugle, butt, buzz, cackle, calabash, calean, call,
   calumet, canalize, carillon, carol, carry, cask, caterwaul,
   catheter, caw, channel, channelize, chant, chatter, cheep, chimera,
   chirk, chirp, chirr, chirrup, chitter, choir, chorus, chuck,
   churchwarden, clack, clarinet, clarion, clay, cluck,
   cock-a-doodle-doo, column, conduct, conduit, contrabassoon,
   contrafagotto, convey, conveyor, coo, corncob, corncob pipe, creak,
   croak, cromorne, cronk, croon, crow, cry, cuckoo, cylinder,
   cylindroid, deliver, descant, do-re-mi, doodle, double bassoon,
   double reed, double-tongue, drainpipe, drawl, dream, drum, duct,
   efflux tube, embouchure, exclaim, fantasy, fife, fipple flute,
   fire hose, flageolet, flue pipe, flume, flute, funnel, gabble,
   gaggle, garden hose, gas pipe, gasp, gobble, groan, growl, grunt,
   guggle, hautboy, heckelphone, hiss, hogshead, honk, hoo, hookah,
   hoot, horn, hornpipe, hose, hosepipe, howl, hubble-bubble, hum,
   hush up, hymn, intonate, intone, keen, keg, key, licorice stick,
   lilt, line, lip, look at, main, make oneself heard, meerschaum,
   minstrel, moan, mouthpiece, mumble, murmur, musette, mutter,
   nargileh, nipple, note, notice, oaten reed, oboe, oboe da caccia,
   ocarina, offer, organ pipe, panpipe, pant, passage, peace pipe,
   peal, peep, penny-whistle, piccolo, pillar, pip, pipe cleaner,
   pipe down, pipe rack, pipe up, pipeline, pipette, piping, pommer,
   psalm, put through, put through channels, quack, quaver, recorder,
   reed, reed instrument, reed pipe, roar, roll, roller, roulade,
   rouleau, rumble, sax, saxophone, say, scold, screak, scream,
   screech, serenade, setup, shake, shawm, shriek, shrill, shut up,
   siamese, siamese connection, sibilate, sigh, sing, sing in chorus,
   single reed, single-reed instrument, siphon, skirl, skreigh, slide,
   snap, snarl, snorkel, snort, sob, soil pipe, sol-fa, solmizate,
   sonorophone, sough, sound, sound a tattoo, sound taps, speak up,
   spot, squall, squawk, squeak, squeal, standpipe, steam pipe, stem,
   straw, supply, sweet potato, syrinx, tabor pipe, tap, tenoroon,
   thunder, tin-whistle, tobacco pipe, tobacco pouch, tongue, toot,
   tooter, tootle, traject, transmit, tremolo, trench, trill,
   triple-tongue, troll, trumpet, trunk, tube, tubing, tubulation,
   tubule, tubulet, tubulure, tun, twang, tweedle, tweedledee, tweet,
   twit, twitter, ululate, ululation, valve, vocalize, volunteer,
   wail, warble, waste pipe, water pipe, weep, whine, whisper,
   whistle, wind, wind instrument, wind the horn, woods, woodwind,
   woodwind choir, woodwind instrument, wrawl, yammer, yap, yawp,
   yell, yelp, yodel



The Jargon File (version 4.4.7, 29 Dec 2003):

pipe
 n.

    [common] Idiomatically, one's connection to the Internet; in context, the
    expansion ?bit pipe? is understood. A ?fat pipe? is a line with T1 or
    higher capacity. A person with a 28.8 modem might be heard to complain ?I
    need a bigger pipe?.


The Free On-line Dictionary of Computing (30 December 2018):

pipe
piping

   1.  One of Unix's buffers which can be
   written to by one asynchronous process and read by another,
   with the kernel suspending and waking up the sender and
   receiver according to how full the pipe is.  In later versions
   of Unix, rather than using an anonymous kernel-managed
   temporary file to implement a pipe, it can be named and is
   implemented as a local socket pair.

   2.  "|" ASCII character 124.  Used to represent a
   pipe between two processes in a shell command line.  E.g.

   	grep foo log | more

   which feeds the output of grep into the input of more without
   requiring a named temporary file and without waiting for the
   first process to finish.

   3.  A connection to a network.

   See also light pipe.

   (1996-09-24)


Easton's 1897 Bible Dictionary:

Pipe
   (1 Sam. 10:5; 1 Kings 1:40; Isa. 5:12; 30:29). The Hebrew word
   halil, so rendered, means "bored through," and is the name given
   to various kinds of wind instruments, as the fife, flute,
   Pan-pipes, etc. In Amos 6:5 this word is rendered "instrument of
   music." This instrument is mentioned also in the New Testament
   (Matt. 11:17; 1 Cor. 14:7). It is still used in Palestine, and
   is, as in ancient times, made of different materials, as reed,
   copper, bronze, etc.


Bouvier's Law Dictionary, Revised 6th Ed (1856):

PIPE, Eng. laid. The name of a roll in the exchequer otherwise called the
Great Roll. A measure containing two hogsheads; one hundred and twenty-six
gallons is also called a pipe.