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oidium
o·id·i·um [ ō íddee əm ] (plural o·id·i·a [ ō íddee ə ])


noun 
Definition:
 
spore of fungi: a thin-walled egg-shaped fungal spore produced by the fragmentation of a hypha
[Mid-19th century. Via modern Latin< Greek ōion "egg" (see oo-)]
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