Wordnet 3.0
ADJECTIVE (1)
1. 
 occurring singly; 
 not one of a pair; 
- Example: "the azygous muscle of the uvula"[syn: azygous, azygos]
WordNet (r) 3.0 (2006):
azygos
    adj 1: occurring singly; not one of a pair; "the azygous muscle
           of the uvula" [syn: azygous, azygos]