| RHI | a family of fungi of order Hymenogastrales having round subterranean sporophores |
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| RHI | any of various rot-causing fungi of the genus Rhizopus |
| RHI | a mold of the genus Rhizopus |
| RHI | fungus causing soft watery rot in fruits and vegetables and rings of dry rot around roots of sweet potatoes |
| RHI | surgical procedure in which spinal nerve roots are cut |