serpentine

a. [ L. serpentinus: cf. F. serpentin. ] 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; as, serpentine braid. [ 1913 Webster ]

Thy shape
Like his, and color serpentine. Milton. [ 1913 Webster ]

n. [ Cf. (for sense 1) F. serpentine, (for sense 2) serpentin. ] 1. (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. [ 1913 Webster ]

☞ Serpentine has been largely produced by the alteration of other minerals, especially of chrysolite. [ 1913 Webster ]

2. (Ordnance) A kind of ancient cannon. [ 1913 Webster ]

v. i. To serpentize. [ R. ] Lyttleton. [ 1913 Webster ]