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.n. 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.n. 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.n. A kind of still; a serpentary.n. A hydrous silicate of magnesium, occurring massive, sometimes fine, granular, and compact, again finely fibrous, less often slaty.To wind like a serpent; move sinuously like a snake; meander; wriggle.n. In mathematics: The surface generated by a sphere whose center travels along a helix.n. A special curve of the third order.