Webster's English Dictionary

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serpentine

1. ser.pen.tine \'s*r-p*n-.te-n, -.ti-n\ aj [ME, fr. MF serpentin, fr. LL 
   serpentinus, fr. L serpent-, Xserpens 1: of or resembling a serpent (as in 
   form or movement)  2: subtly wily or tempting : DIABOLIC  3: winding or 
   turning one way and another : SINUOUS 
2. serpentine n : something that winds sinuously 
3. serpentine n [ME, fr. ML serpentia, serpentinum, fr. LL, fem. & neut. of 
   serp]entinus resembling a serpent : a mineral or rock consisting 
   essentially of a hydrous magnesium silicate  H4Mg3Si2O usu. having a dull 
   green color and often a mottled appearance