| DRAGONROOT | • dragonroot n. The plant green dragon. • DRAGONROOT n. (US) an araceous plant (genus Arisaema) or its tuberous root, used in medicine. |
| GEOCORONAE | • GEOCORONA n. an outer layer of the earth's atmosphere. |
| GEOCORONAS | • geocoronas n. Plural of geocorona. • GEOCORONA n. an outer layer of the earth's atmosphere. |
| GONORRHOEA | • gonorrhoea n. (British spelling) Alternative spelling of gonorrhea. • gonorrhœa n. Obsolete spelling of gonorrhea. • GONORRHOEA n. a sexually transmitted contagious infection of the mucous membrane of the genital tract, also GONORRHEA. |
| HORMOGONIA | • hormogonia n. Plural of hormogonium. • HORMOGONIUM n. a portion of a filament in many cyanobacteria that becomes detached as a reproductive body. |
| LOGORRHOEA | • logorrhoea n. (British spelling) Alternative spelling of logorrhea. • logorrhœa n. (British spelling) Obsolete spelling of logorrhea. • LOGORRHOEA n. uncontrollable garrulity. |
| ORANGEWOOD | • orangewood n. The wood of the orange tree. • ORANGEWOOD n. the wood of the orange-tree. |
| ORGANOLOGY | • organology n. (Biology) The study of the organs of plants and animals. • organology n. The study of musical instruments in relation to history, culture, and construction. • ORGANOLOGY n. the science of organs or of anything considered as an organic structure. |
| ORGANOSOLS | • organosols n. Plural of organosol. • ORGANOSOL n. a resin-based coating. |
| OROLOGICAL | • orological adj. (Obsolete, rare) Of or pertaining to orology. • OROLOGICAL adj. of or pertaining to orology. |
| ORTHOGONAL | • orthogonal adj. (Geometry) Of two objects, at right angles; perpendicular to each other. • orthogonal adj. (Mathematics). • orthogonal adj. (Statistics) Statistically independent, with reference to variates. |
| SPOROGONIA | • sporogonia n. Plural of sporogonium. • SPOROGONIUM n. an organ that produces asexual spores in mosses. |