| 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. |
| ALLODIA | • allodia n. Plural of allodium. • ALLODIUM n. (Latin) an estate held in absolute ownership, also ALLOD, ALOD, ALODIUM. |
| ARCADIA | • arcadia n. Alternative letter-case form of Arcadia. • Arcadia prop.n. A regional unit of Greece in the central and southeastern Peloponnese. Tripoli is the capital and main… • Arcadia prop.n. A mountainous region of Ancient Greece, named for Greek mythological hero Arcas; legendary home of the… |
| 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. |
| EXORDIA | • exordia n. Plural of exordium. • EXORDIUM n. (Latin) a beginning. |
| GIARDIA | • giardia n. The human intestinal parasite Giardia lamblia. • giardia n. (Pathology) Giardiasis, the disease caused by the parasite. • Giardia n. Alternative letter-case form of giardia. |
| GONIDIA | • gonidia n. Plural of gonidium. • GONIDIUM n. an algal cell in a lichen. |
| MELODIA | • MELODIA n. (Latin) a type of organ stop. |
| PERIDIA | • peridia n. Plural of peridium. • PERIDIUM n. the outer coating of the spore carrier of a fungus. |
| 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. |
| SCANDIA | • scandia n. Scandium oxide. • Scandia prop.n. (Poetic) Scandinavia. • Scandia prop.n. A hamlet in Alberta, Canada. |
| SOREDIA | • soredia n. Plural of soredium. • SOREDIUM n. (Greek) a reproductive body in lichens. |