1. smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings; [syn: onion smut, Urocystis cepulae]
WordNet (r) 3.0 (2006):
onion smut
n 1: smut fungus causing blackish blisters on scales and leaves
of onions; especially destructive to seedlings [syn: onion
smut, Urocystis cepulae]