| CUMULONIMBUS | • cumulonimbus n. (Meteorology) A cloud, with a tall structure and a flat base, that is often associated with thunderstorms. • cumulo-nimbus n. Alternative form of cumulonimbus. • CUMULONIMBUS n. a type of cloud. | 
| GUBERNACULUM | • gubernaculum n. A part or structure that serves as a guide… • GUBERNACULUM n. in mammals, the cord supporting the testicles in the scrotal sac. | 
| INFUNDIBULUM | • infundibulum n. (Anatomy) A funnel-shaped cavity or organ. • INFUNDIBULUM n. a funnel-shaped body part (e.g. the nares). | 
| LUGUBRIOUSLY | • lugubriously adv. In a lugubrious manner. • LUGUBRIOUS adv. mournful, dismal, esp. in an exaggerated or affected manner. | 
| RUMBUNCTIOUS | • rumbunctious adj. Alternative spelling of rambunctious. • RUMBUNCTIOUS adj. boisterous, unruly, also RAMBUNCTIOUS. | 
| SUBAURICULAR | • subauricular adj. Beneath the ear. • SUBAURICULAR adj. below the ear. | 
| SUBCULTURING | • subculturing v. Present participle of subculture. • subculturing n. The preparation of a subculture. • SUBCULTURE v. to create a subculture e.g. of bacteria. | 
| SUBCUTANEOUS | • subcutaneous adj. Pertaining to the fatty layer under the skin. • SUBCUTANEOUS adj. beneath the skin. | 
| SUBNUCLEUSES | • SUBNUCLEUS n. a secondary nucleus. | 
| SUBOPERCULUM | • suboperculum n. (Anatomy) The lower opercular bone in fishes. • SUBOPERCULUM n. in fishes, a bone below and partly behind the gill cover. | 
| SUBSTRUCTURE | • substructure n. The supporting part of a structure (either physical or organizational; the foundation). • substructure n. The earth or gravel that the railway tracks are embedded in. • substructure n. (Marxism) Synonym of base (“the forces and relations of production that produce the necessities and… | 
| SUBUNGULATES | • subungulates n. Plural of subungulate. • SUBUNGULATE n. a member of the Subungulata. | 
| UBIQUITOUSLY | • ubiquitously adv. In a ubiquitous manner. • UBIQUITOUS adv. being everywhere at once, also UBIQUITARY. |