Search Result for "virga": 
Wordnet 3.0

NOUN (1)

1. light wispy precipitation that evaporates before it reaches the ground (especially when the lower air is low in humidity); 



WordNet (r) 3.0 (2006):

virga
    n 1: light wispy precipitation that evaporates before it reaches
         the ground (especially when the lower air is low in
         humidity)