Serpentine

Part of speech: noun (n.)

1. 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.

2. A kind of ancient cannon.

Part of speech: verb (v.)

To serpentize. [R.] Lyttleton.

Part of speech: adjective (a.)

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. Thy shape Like his, and color serpentine. Milton.