penicillia definition by American Heritage Dictionary
A plural of penicillium.
Variant of penicillium
noun pl. penicilliums or penicillia
any of a genus (Penicillium) of imperfect fungi growing as green mold on stale bread, ripening cheese, decaying fruit, etc.: penicillin is derived from some species
Origin: Modern Latin ; from Classical Latin penicillus (see pencil): from the tuftlike ends of the conidiophores