| ACCIDIA | • ACCIDIA n. (Latin) sloth; physical torpor, also ACCIDIE, ACEDIA. |
| AECIDIA | • aecidia n. Plural of aecidium. • AECIDIUM n. (Greek) a cup-shaped structure in rust fungi, also AECIUM. |
| ASCIDIA | • ascidia n. Plural of ascidium. • Ascidia prop.n. A taxonomic genus within the family Ascidiidae – certain tunicates. • ASCIDIUM n. a pitcher-shaped, or flask-shaped, organ or appendage of a plant. |
| ASPIDIA | • aspidia n. Plural of aspidium. • ASPIDIUM n. (Greek) a type of fern. |
| BASIDIA | • basidia n. Plural of basidium. • BASIDIUM n. (Greek) a fungal fructification from which spores are released. |
| CONIDIA | • conidia n. Plural of conidium. • CONIDIUM n. (Greek) a kind of reproductive cell found in certain fungi, and often containing zoospores. |
| DAVIDIA | • davidia n. (Botany) Any of the genus Davidia of flowering trees. • DAVIDIA n. a kind of tree, aka handkerchief tree. |
| GONIDIA | • gonidia n. Plural of gonidium. • GONIDIUM n. an algal cell in a lichen. |
| IRIDIAL | • iridial adj. Relating to the iris of the eye. • IRIDIAL adj. relating to the iris of the eye, also IRIDAL, IRIDIAN, IRIDIC. |
| IRIDIAN | • iridian adj. (Mineralogy) Describing minerals containing iridium. • iridian adj. Of or relating to the iris or rainbow. • Iridian adj. Of or relating to Iris. |
| PERIDIA | • peridia n. Plural of peridium. • PERIDIUM n. the outer coating of the spore carrier of a fungus. |
| PRIDIAN | • pridian adj. Of or relating to the day before, or yesterday. • PRIDIAN adj. of or pertaining to the previous day. |
| PYGIDIA | • pygidia n. Plural of pygidium. • PYGIDIUM n. in trilobites, the posterior division of the body, formed by fusion of the telson with one or more posterior pleurae. |
| PYXIDIA | • pyxidia n. Plural of pyxidium. • PYXIDIUM n. a capsule that opens by a transverse circular split. |
| SUIDIAN | • SUIDIAN adj. belonging to the pig family. • SUIDIAN n. a member of the pig family, also SUID. |