The Collaborative International Dictionary of English v.0.48:

Snake \Snake\, n. [AS. snaca; akin to LG. snake, schnake, Icel.
   sn[=a]kr, sn?kr, Dan. snog, Sw. snok; of uncertain origin.]
   (Zool.)
   Any species of the order Ophidia; an ophidian; a serpent,
   whether harmless or venomous. See Ophidia, and Serpent.
   [1913 Webster]

   Note: Snakes are abundant in all warm countries, and much the
         larger number are harmless to man.
         [1913 Webster]

   Blind snake, Garter snake, Green snake, King snake,
   Milk snake, Rock snake, Water snake, etc. See under
      Blind, Garter, etc.

   Fetich snake (Zool.), a large African snake (Python
      Sebae) used by the natives as a fetich.

   Ringed snake (Zool.), a common European columbrine snake
      (Tropidonotus natrix).

   Snake eater. (Zool.)
   (a) The markhoor.
   (b) The secretary bird.

   Snake fence, a worm fence (which see). [U.S.]

   Snake fly (Zool.), any one of several species of
      neuropterous insects of the genus Rhaphidia; -- so
      called because of their large head and elongated neck and
      prothorax.

   Snake gourd (Bot.), a cucurbitaceous plant (Trichosanthes
      anguina) having the fruit shorter and less snakelike than
      that of the serpent cucumber.

   Snake killer. (Zool.)
   (a) The secretary bird.
   (b) The chaparral cock.

   Snake moss (Bot.), the common club moss (Lycopodium
      clavatum). See Lycopodium.

   Snake nut (Bot.), the fruit of a sapindaceous tree
      (Ophiocaryon paradoxum) of Guiana, the embryo of which
      resembles a snake coiled up.

   Tree snake (Zool.), any one of numerous species of
      colubrine snakes which habitually live in trees,
      especially those of the genus Dendrophis and allied
      genera.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snake \Snake\, v. i.
   To crawl like a snake.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snake \Snake\, v. t. [imp. & p. p. Snaked; p. pr. & vb. n.
   Snaking.]
   1. To drag or draw, as a snake from a hole; -- often with
      out. [Colloq. U.S.] --Bartlett.
      [1913 Webster]

   2. (Naut.) To wind round spirally, as a large rope with a
      smaller, or with cord, the small rope lying in the spaces
      between the strands of the large one; to worm.
      [1913 Webster]

WordNet (r) 3.0 (2006):

snake
    n 1: limbless scaly elongate reptile; some are venomous [syn:
         snake, serpent, ophidian]
    2: a deceitful or treacherous person [syn: snake, snake in
       the grass]
    3: a tributary of the Columbia River that rises in Wyoming and
       flows westward; discovered in 1805 by the Lewis and Clark
       Expedition [syn: Snake, Snake River]
    4: a long faint constellation in the southern hemisphere near
       the equator stretching between Virgo and Cancer [syn:
       Hydra, Snake]
    5: something long, thin, and flexible that resembles a snake
    v 1: move smoothly and sinuously, like a snake
    2: form a snake-like pattern; "The river snakes through the
       valley"
    3: move along a winding path; "The army snaked through the
       jungle"

Moby Thesaurus II by Grady Ward, 1.0:

209 Moby Thesaurus words for "snake":
   Benedict Arnold, Brutus, Judas, Judas Iscariot, Quisling, adder,
   anaconda, animal, archtraitor, asp, beast, bend, betrayer,
   blacksnake, blind snake, boa, boa constrictor, bull snake,
   bushmaster, cobra, cobra de capello, cockatrice, conniver,
   conspirator, conspirer, constrictor, contort, copperhead,
   coral snake, corkscrew, cottonmouth, crawl, creep, crinkle, crook,
   cur, curve, daboia, diamondback, divagate, dog, double agent,
   double-crosser, double-dealer, drag, draggle, draw, drift, err,
   excurse, fer-de-lance, fink, flick, flip, flirt, flounce,
   garter snake, glide, go adrift, go astray, go on tiptoe,
   gopher snake, grovel, gumshoe, hale, hamadryad, haul, heave, hitch,
   hog-nose snake, hook, horned rattlesnake, horned viper, hound,
   hyena, inch, inch along, informer, insect, intort, intrigant,
   intriguer, jerk, jig, jigger, jigget, jiggle, jog, joggle,
   king cobra, king snake, krait, lift, loop, lug, lurk, machinator,
   mamba, meander, milk snake, moccasin, mongrel, nab, nail, nick,
   nightwalk, nip, ophidian, pad, pererrate, pig, pinch, pine snake,
   pit viper, plotter, pluck, polecat, prick, prowl, puff adder, pull,
   pussyfoot, python, quisling, racer, ramble, rat, rat snake,
   rattler, rattlesnake, reptile, rove, scallop, schemer, scrabble,
   scramble, screw, scum, sea snake, serpent, serpentine, shirk, shit,
   shithead, shovel-nose, sidewinder, sidle, skulk, skunk, slidder,
   slide, slink, slip, slither, snatch, sneak, snitch,
   spectacled cobra, steal, steal along, straggle, stray, swine,
   swipe, swirl, take in tow, thunder snake, timeserver, tippytoe,
   tiptoe, toad, tow, trail, train, traitor, trawl, treasonist,
   trimmer, troll, tug, turd, turn, turncoat, tweak, twine, twirl,
   twist, twist and turn, twitch, undulate, urutu, varmint, vermin,
   viper, wander, water moccasin, water snake, whelp, whirl, whorl,
   wind, worm, worm along, worm snake, wrench, wring, yank, yerk,
   zigzag