noun, plural penicilliums, penicillia [pen-uh-sil-ee-uh] .
any fungus of the genus Penicillium, certain species of which are used in cheesemaking and as the source of penicillin.

1925–30; < Neo-Latin, equivalent to Latin pēnicill(us) brush (see pencil) + -ium -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
penicillium (ˌpɛnɪˈsɪlɪəm)
n , pl -cilliums, -cillia
any ascomycetous saprotrophic fungus of the genus Penicillium, which commonly grow as a green or blue mould on stale food: some species are used in cheese-making and others as a source of penicillin
[C19: New Latin, from Latin pēnicillus tuft of hairs; named from the tufted appearance of the sporangia of this fungus]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

penicillium pen·i·cil·li·um (pěn'ĭ-sĭl'ē-əm)
n. pl. pen·i·cil·li·ums or pen·i·cil·li·a (-sĭl'ē-ə)
Any of various bluish-green fungi of the genus Penicillium that grow as molds on decaying fruits and ripening cheese and are used in the production of penicillin.

Penicillium n.
A genus of fungi of the class Ascomycetes, some species of which yield several antibiotic substances and biologics.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
penicillium   (pěn'ĭ-sĭl'ē-əm)  Pronunciation Key 
Plural penicilliums or penicillia
Any of various bluish-green fungi of the genus Penicillium, that grow as molds on decaying fruits, ripening cheeses, and bread, and are used to produce penicillin and certain other antibiotics.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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