o·id·i·um

[oh-id-ee-uhm]
noun, plural o·id·i·a [oh-id-ee-uh] . Mycology.
1.
one of the conidia that are borne in chains by certain fungi.
2.
(in certain fungi) a thin-walled spore derived from the fragmentation of a hypha into its component cells.

Origin:
1855–60; < Neo-Latin < Greek ōi(ón) egg (cognate with Latin ovum; see oo-) + -idium -idium

o·id·i·oid, adjective
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World English Dictionary
oidium (əʊˈɪdɪəm) [Click for IPA pronunciation guide]
 
n , pl -ia
botany any of various fungal spores produced in the form of a chain by the development of septa in a hypha
 
[New Latin: from oo- + -idium diminutive suffix]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Oidium is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Encyclopedia Britannica
Encyclopedia

oidium

in fungi (kingdom Fungi), a single-celled asexual spore (arthrospore) produced by fragmentation of fungal filaments (hyphae) in lower fungi; the asexual stage of Erysiphaceae (powdery mildew fungi); or, in Basidiomycota, both an asexual spore (microconidium) and a male cell (spermatium).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences from the web
The species has also been known in the past as monilia albicans and oidium albicans.
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