Wordnet 3.0
NOUN (1)
1. 
 a tortuous and twisted shape or position; 
- Example: "they built a tree house in the tortuosities of its boughs"- Example: "the acrobat performed incredible contortions"[syn: tortuosity, tortuousness, torsion, contortion, crookedness]
WordNet (r) 3.0 (2006):
tortuosity
    n 1: a tortuous and twisted shape or position; "they built a
         tree house in the tortuosities of its boughs"; "the acrobat
         performed incredible contortions" [syn: tortuosity,
         tortuousness, torsion, contortion, crookedness]