virga

from 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)
    
from Bouvier's Law Dictionary, Revised 6th Ed (1856)
VIRGA. An obsolete word, which signifies a rod or staff, such as sheriffs, 
bailiffs, and constables carry, as a badge or ensign of their office. 
    

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