[oh-id-ee-uh m]

noun, plural o·id·i·a [oh-id-ee-uh] /oʊˈɪd i ə/. Mycology.

one of the conidia that are borne in chains by certain fungi.
(in certain fungi) a thin-walled spore derived from the fragmentation of a hypha into its component cells.

Origin of oidium

1855–60; < New Latin < Greek ōi(ón) egg1 (cognate with Latin ovum; see oo-) + -idium -idium
Related formso·id·i·oid, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for oidium

Contemporary Examples of oidium

Historical Examples of oidium

  • In the hall they were discussing another and far worse form of oidium.

    The Patriot

    Antonio Fogazzaro

  • Shortly after the flies had some mouldy cream, the Oidium lactis was found in their fæces.

  • Berg, in 1839–41, showed that thrush is likewise due to a fungus, Oidium albicans.

    The Fundamentals of Bacteriology

    Charles Bradfield Morrey

  • In this ripening there is a prompt development of a heavy viscous slime, which consists of Oidium and bacteria.

    The Book of Cheese

    Charles Thom and Walter Warner Fisk

  • This occurs very rapidly under the attack of Oidium lactis accompanied by bacteria.

    The Book of Cheese

    Charles Thom and Walter Warner Fisk

British Dictionary definitions for oidium


noun plural -ia (-ɪə)

botany any of various fungal spores produced in the form of a chain by the development of septa in a hypha

Word Origin for oidium

New Latin: from oo- + -idium diminutive suffix
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