OIDIUM
- a type of fungus (any of the major group of lower plants) [n OIDIA]
- a type of fungus (any of a major group of lower plants) [n OIDIA] : OIDIOID [adj]
- 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
- powdery mildew especially of grapes caused by an oidium