Source : Webster's Revised Unabridged Dictionary (1913)

Azygous \Az"y*gous\, a. [Gr. ?; 'a priv. + ? yoke.]
   Odd; having no fellow; not one of a pair; single; as, the
   azygous muscle of the uvula.

Source : WordNet®

azygous
     adj : occurring singly; not one of a pair; "the azygous muscle of
           the uvula" [syn: {azygos}]