SERPENTINE

I. adjective Etymology: Middle English, from Anglo-French serpentin, from Late Latin serpentinus, from Latin serpent-, serpens Date: 15th century of or resembling a serpent (as in form or movement), subtly wily or tempting, 3. winding or turning one way and another , having a compound curve whose central curve is convex, ~ly adverb II. noun Date: 1519 something that winds sinuously, III. noun Etymology: Middle English, from Anglo-French serpentin, Medieval Latin serpentina, serpentinum, from Late Latin, feminine & neuter of serpentinus resembling a serpent Date: 15th century a mineral or rock consisting essentially of a hydrous magnesium silicate usually having a dull green color and often a mottled appearance