Wordnet 3.0
ADJECTIVE (1)
1. 
 (used with singular count nouns) colloquial for `not a' or `not one' or `never a'; 
- Example: "heard nary a sound"
WordNet (r) 3.0 (2006):
nary
    adj 1: (used with singular count nouns) colloquial for `not a'
           or `not one' or `never a'; "heard nary a sound"