| ANIRIDIA | • aniridia n. A rare congenital condition characterized by the underdevelopment of the iris of the eye. • ANIRIDIA n. a congenital condition in which the eye is incompletely formed. |
| ANTHERIDIA | • antheridia n. Plural of antheridium. • ANTHERIDIUM n. the male reproductive organ of some plants, also ANTHERID. |
| CLOSTRIDIA | • clostridia n. Plural of clostridium. • Clostridia prop.n. A taxonomic class within the phylum Firmicutes – clostridium and related bacteria. • CLOSTRIDIUM n. any of a genus of spore-forming mostly anaerobic soil or intestinal bacteria. |
| CRYPTOSPORIDIA | • cryptosporidia n. Plural of cryptosporidium. • CRYPTOSPORIDIUM n. any of a genus of protozoans parasitic in the gut of vertebrates including humans and sometimes causing diarrhea. |
| ENCHEIRIDIA | • ENCHEIRIDION n. a handbook or a manual, also ENCHIRIDION. |
| ENCHIRIDIA | • enchiridia n. Plural of enchiridion. • ENCHIRIDION n. a manual or handbook, also ENCHEIRIDION. |
| HESPERIDIA | • hesperidia n. Plural of hesperidium. • HESPERIDIUM n. a plant with a berry like a citrus fruit. |
| NEPHRIDIA | • nephridia n. Plural of nephridium. • NEPHRIDIUM n. in invertebrates and lower chordates, an organ serving the function of a kidney. |
| PERIDIA | • peridia n. Plural of peridium. • PERIDIUM n. the outer coating of the spore carrier of a fungus. |
| SPHAERIDIA | • sphaeridia n. Plural of sphaeridium. • SPHAERIDIUM n. a minute spheroidal body on the surface of a sea urchin, perhaps a sense organ. |
| SPORIDIA | • sporidia n. Plural of sporidium. • SPORIDIUM n. a secondary spore, or a filament produced from a spore, in certain kinds of minute fungi. |
| TIGRIDIA | • Tigridia prop.n. A taxonomic genus within the family Iridaceae – various bulbous or cormous flowering plants. • TIGRIDIA n. a tropical American plant with colourful flowers. |