Serpentine

adj. like a serpent; twisting, winding; sly, wily, treacherous

n. hydrous magnesium silicate, common mineral which resembles jade (used for decoration)

Serpentine is a group of common rock-forming hydrous magnesium iron phyllosilicate ((, Fe)3O) minerals; it may contain minor amounts of other elements including chromium, manganese, cobalt and nickel. In mineralogy and gemology, serpentine may refer to any of 20 varieties belonging to the serpentine group. Owing to admixture, these varieties are not always easy to individualize, and distinctions are not usually made. There are three important mineral polymorphs of serpentine: antigorite, chrysotile and lizardite.
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Adjective
1. resembling a serpent in form; "a serpentine wall"; "snaky ridges in the sand"
(synonym) snaky, snakelike
(similar) curved, curving

n. winding road, zigzag road

n. serpentine, hydrous magnesium silicate, common mineral which resembles jade (used for decoration)

n. serpentine, hydrous magnesium silicate, common mineral which resembles jade (used for decoration), ophite