serpentine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of or resembling a serpent, as in form or movement; sinuous.
• adjective Subtly sly and tempting.
• adjective Relating to or derived from serpentine or soil containing serpentine.
• noun Any of a group of greenish, brownish, or spotted minerals, Mg₃Si₂O₅(OH)₄, used as a source of magnesium and asbestos, and in architecture as a decorative stone.

from The Century Dictionary.

• To wind like a serpent; move sinuously like a snake; meander; wriggle.
• noun In mathematics: The surface generated by a sphere whose center travels along a helix.
• noun A special curve of the third order.
• Of or pertaining to or resembling a serpent.
• Especially—
• Having or resembling the qualities or instincts ascribed to serpents; subtle; cunning; treacherous or dangerous.
• Moving like a serpent; winding about; writhing; wriggling; meandering; coiling; crooked; bent; tortuous; sinuous; zigzag; anfractuous; specifically, in the manège, lolling out and moving over the bit, as a horse's tongue.
• Beginning and ending with the same word, as a line of poetry, as if returning upon itself. See serpentine verse.
• noun In French usage, part of the lock of an early form of harquebus; a match-holder, resembling a pair of nippers, which could be brought down upon the powder in the pan.
• noun A cannon in use in the sixteenth century. The serpentine proper is described as having a bore of 1½ inches, and the cannon serpentine as having a bore of 7 inches and a shot of 53½ pounds. Compare organ-gun.
• noun A kind of still; a serpentary.
• noun A hydrous silicate of magnesium, occurring massive, sometimes fine, granular, and compact, again finely fibrous, less often slaty.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Resembling a serpent; having the shape or qualities of a serpent; subtle; winding or turning one way and the other, like a moving serpent; anfractuous; meandering; sinuous; zigzag.
• intransitive verb rare To serpentize.
• noun (Min.) A mineral or rock consisting chiefly of the hydrous silicate of magnesia. It is usually of an obscure green color, often with a spotted or mottled appearance resembling a serpent's skin. Precious, or noble, serpentine is translucent and of a rich oil-green color.
• noun (Ordnance) A kind of ancient cannon.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Sinuous; curving in alternate directions.
• adjective Having the shape or form of a snake.
• adjective Of, pertaining to, or characteristic of snakes.
• adjective Of, or having attributes associated with, the mythological serpent, such as craftiness or deceitfulness.
• noun Any of several plants believed to cure snakebites.
• noun An early form of cannon.
• noun A coiled distillation tube.
• verb archaic To serpentize; to turn or bend; to meander.
• adjective geology, botany Of or characteristic of serpentine rocks or the plants that grow there.
• noun mineralogy Any of several green/brown minerals consisting of a magnesium and iron silicates.
• noun mineralogy Any of many minerals that have the same layered crystal structure.
• noun geology An outcrop or region with soil and rock dominated by these minerals.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective resembling a serpent in form