from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A thin-walled spore produced by fragmentation in certain filamentous fungi.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fragile spore produced by some fungi
- n. A fungus, Uncinula necator , that produces powdery mildew in grapes
New Latin Ōidium, fungus genus, from Greek ōion, egg; see oo-.(American Heritage® Dictionary of the English Language, Fourth Edition)