| LUGUBRIOUS | • lugubrious adj. Gloomy, mournful or dismal, especially to an exaggerated degree. • LUGUBRIOUS adj. mournful, dismal, esp. in an exaggerated or affected manner. | 
| PUBERULOUS | • puberulous adj. Puberulent. • PUBERULOUS adj. feebly or minutely pubescent; covered with minute down, also PUBERULENT. | 
| SUBAQUEOUS | • subaqueous adj. Existing below the water surface. • subaqueous adj. Designed for underwater use. • subaqueous adj. Weak and filtered. | 
| SUBBUREAUS | • subbureaus n. Plural of subbureau. • SUBBUREAU n. a subdivision of a bureau. | 
| SUBBUREAUX | • subbureaux n. Plural of subbureau. • SUBBUREAU n. a subdivision of a bureau. | 
| SUBCULTURE | • subculture n. A portion of a culture distinguished by its customs or other features, often in contrast to the larger… • subculture n. (Biology) A culture made by transferring microorganisms from a previous culture to a fresh growth medium. • subculture v. (Biology) To transfer (microorganisms) to a fresh growth medium in order to start a new culture. | 
| SUBFUSCOUS | • subfuscous adj. Duskish; moderately dark; tawny. • SUBFUSCOUS adj. duskish; moderately dark, also SUBFUSC, SUBFUSK. | 
| SUBNUCLEUS | • subnucleus n. A secondary nucleus (of neurons). • SUBNUCLEUS n. a secondary nucleus. | 
| SUCCUBUSES | • succubuses n. Plural of succubus. • SUCCUBUS n. (Latin) a female demon, also SUCCUBA. | 
| TUBERCULUM | • tuberculum n. Tubercle. • TUBERCULUM n. a tubercle. | 
| TUBULATURE | • tubulature n. (Chemistry) A tubulure. • TUBULATURE n. tubes collectively. | 
| TUBULOUSLY | • tubulously adv. In a tubulous manner. • TUBULOUS adv. shaped like a tube, also TUBULAR, TUBAR, TUBATE, TUBIFORM, TUBULOSE. | 
| UBIQUITOUS | • ubiquitous adj. Being everywhere at once: omnipresent. • ubiquitous adj. Appearing to be everywhere at once; being or seeming to be in more than one location at the same time. • ubiquitous adj. Widespread; very prevalent. | 
| UMBRACULUM | • umbraculum n. (Botany) Any umbrella-shaped appendage, such as the cap borne on the seta of Marchantia. • UMBRACULUM n. (Latin) an umbrella or umbrella-like structure. | 
| UNDOUBTFUL | • undoubtful adj. Not doubtful. • UNDOUBTFUL adj. not doubtful. | 
| USQUEBAUGH | • usquebaugh n. Whisky, whiskey. • USQUEBAUGH n. (Gaelic) whiskey, also USQUABAE, USQUE, USQUEBAE. |