The Collaborative International Dictionary of English v.0.48:

Kingfish \King"fish`\ (k[i^]ng"f[i^]sh`), n. (Zool.)
   (a) An American marine food fish of the genus Menticirrus,
       especially Menticirrus saxatilis, or Menticirrus
       nebulosos, of the Atlantic coast; -- called also
       whiting, surf whiting, and barb.
   (b) The opah.
   (c) The common cero; also, the spotted cero. See Cero.
   (d) The queenfish.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barb \Barb\, v. t. [imp. & p. p. Barbed (b[aum]rbd); p. pr. &
   vb. n. Barbing.]
   1. To shave or dress the beard of. [Obs.]
      [1913 Webster]

   2. To clip; to mow. [Obs.] --Marston.
      [1913 Webster]

   3. To furnish with barbs, or with that which will hold or
      hurt like barbs, as an arrow, fishhook, spear, etc.
      [1913 Webster]

            But rattling storm of arrows barbed with fire.
                                                  --Milton.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barb \Barb\ (b[aum]rb), n. [F. barbe, fr. L. barba beard. See
   Beard, n.]
   1. Beard, or that which resembles it, or grows in the place
      of it.
      [1913 Webster]

            The barbel, so called by reason of his barbs, or
            wattles in his mouth.                 --Walton.
      [1913 Webster]

   2. A muffler, worn by nuns and mourners. [Obs.]
      [1913 Webster]

   3. pl. Paps, or little projections, of the mucous membrane,
      which mark the opening of the submaxillary glands under
      the tongue in horses and cattle. The name is mostly
      applied when the barbs are inflamed and swollen. [Written
      also barbel and barble.]
      [1913 Webster]

   4. The point that stands backward in an arrow, fishhook,
      etc., to prevent it from being easily extracted. Hence:
      Anything which stands out with a sharp point obliquely or
      crosswise to something else. "Having two barbs or points."
      --Ascham.
      [1913 Webster]

   5. A bit for a horse. [Obs.] --Spenser.
      [1913 Webster]

   6. (Zool.) One of the side branches of a feather, which
      collectively constitute the vane. See Feather.
      [1913 Webster]

   7. (Zool.) A southern name for the kingfishes of the eastern
      and southeastern coasts of the United States; -- also
      improperly called whiting.
      [1913 Webster]

   8. (Bot.) A hair or bristle ending in a double hook.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barb \Barb\, n. [F. barbe, fr. Barbarie.]
   1. The Barbary horse, a superior breed introduced from
      Barbary into Spain by the Moors.
      [1913 Webster]

   2. (Zool.) A blackish or dun variety of the pigeon,
      originally brought from Barbary.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barb \Barb\, n. [Corrupted fr. bard.]
   Armor for a horse. Same as 2d Bard, n., 1.
   [1913 Webster]

WordNet (r) 3.0 (2006):

barb
    n 1: an aggressive remark directed at a person like a missile
         and intended to have a telling effect; "his parting shot
         was `drop dead'"; "she threw shafts of sarcasm"; "she takes
         a dig at me every chance she gets" [syn: shot, shaft,
         slam, dig, barb, jibe, gibe]
    2: the pointed part of barbed wire
    3: a subsidiary point facing opposite from the main point that
       makes an arrowhead or spear hard to remove
    4: one of the parallel filaments projecting from the main shaft
       of a feather
    v 1: provide with barbs; "barbed wire"

Moby Thesaurus II by Grady Ward, 1.0:

113 Moby Thesaurus words for "barb":
   Amytal, Amytal pill, Demerol, Dolophine, H, Luminal, Luminal pill,
   M, Mickey Finn, Nembutal, Nembutal pill, Seconal, Seconal pill,
   Tuinal, Tuinal pill, alcohol, amobarbital sodium, analgesic,
   anodyne, antenna, arrow, arrowhead, barbel, barbiturate,
   barbiturate pill, barbule, barrel, black stuff, blue, blue angel,
   blue devil, blue heaven, blue velvet, bobtailed arrow, bolt,
   bristle, calmative, cat whisker, chested arrow, chloral hydrate,
   cilium, cloth yard shaft, codeine, codeine cough syrup, dart,
   depressant, depressor, dolly, downer, feeler, filament,
   filamentule, flight, goofball, hard stuff, heroin, hop, horse,
   hypnotic, junk, knockout drops, laudanum, liquor, lotus,
   meperidine, methadone, morphia, morphine, narcotic, opiate, opium,
   pacifier, pain killer, paregoric, pen yan, phenobarbital,
   phenobarbital sodium, purple heart, quarrel, quietener, quill,
   rainbow, red, reed, scag, secobarbital sodium, sedative, setula,
   setule, shaft, shit, sleep-inducer, sleeper, sleeping draught,
   sleeping pill, smack, sodium thiopental, somnifacient, soother,
   soothing syrup, soporific, striga, stubble, tactile hair,
   tactile process, tar, tranquilizer, turps, vibrissa, volley,
   white stuff, yellow, yellow jacket