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penicillium

[pen-uh-sil-ee-uh m] /ˌpɛn əˈsɪl i əm/
noun, plural penicilliums, penicillia
[pen-uh-sil-ee-uh] /ˌpɛn əˈsɪl i ə/ (Show IPA)
1.
any fungus of the genus Penicillium, certain species of which are used in cheesemaking and as the source of penicillin.
Origin
1925-1930
1925-30; < Neo-Latin, equivalent to Latin pēnicill(us) brush (see pencil) + -ium -ium
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for penicillia

penicillium

/ˌpɛnɪˈsɪlɪəm/
noun (pl) -cilliums, -cillia (-ˈsɪlɪə)
1.
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
Word Origin
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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penicillia in Medicine

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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penicillia in Science
penicillium
  (pěn'ĭ-sĭl'ē-əm)   
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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