- Any of various fungi of the genus <em>Rhizopus,</em> including several food molds and some species used in preparing fermented foods.
- A genus of zygomycetous fungi having conidial sporophores arising from rhizoids developed at the ends of aërial hyphæ. <em>R. stolonifer</em> is a very common mold, occurring on decaying fruits and vegetables.
- any of various rot causing fungi of the genus Rhizopus