Definition of: serpentine

(sûr′pən·tēn, -tīn) adjective
1. Pertaining to or like a serpent; zigzag or sinuous; crawling sinuously.
2. Subtle; cunning.
—noun A massive or fibrous, often mottled green or yellow, hydrous magnesium silicate, the fibrous varieties of which are important sources of asbestos, the massive as architecturally decorative stones. [<OF serpentin <L serpentinus <serpens SERPENT]