| CENTRUM | • centrum n. A center. • centrum n. (Anatomy). • centrum n. (Seismology) The focus or place of origin of an earthquake. |
| CHETRUM | • chetrum n. A subdivision of currency, equal to one hundredth of a Bhutanese ngultrum. • CHETRUM n. (Tibetan) a monetary unit of Bhutan. |
| DECORUM | • decorum n. (Uncountable) Appropriate social behavior. • decorum n. (Countable) A convention of social behavior. • DECORUM n. (Latin) proper behaviour. |
| EARDRUM | • eardrum n. (Anatomy) A thin membrane that separates the outer ear from the middle ear and transmits sound from… • ear␣drum n. Alternative form of eardrum. • EARDRUM n. the tympanic membrane. |
| ELYTRUM | • elytrum n. Alternative form of elytron. • ELYTRUM n. (Latin) a hardened forewing of certain insects, also ELYTRON. |
| FULCRUM | • fulcrum n. (Mechanics) The support about which a lever pivots. • fulcrum n. (Figurative) A crux or pivot; a central point. • Fulcrum prop.n. (Military) NATO code name for the Soviet MiG-29 aircraft. |
| HUMDRUM | • humdrum adj. Lacking variety or excitement; dull; boring. • humdrum n. (Uncountable) The quality of lacking variety or excitement. • humdrum n. (Countable, dated) A stupid fellow. |
| LABARUM | • labarum n. The Roman military standard adopted by Constantine I. The banner was known for its Christian chi-rho sign - ☧. • LABARUM n. (Latin) a moral standard; an ecclesiastical banner bearing Christ's monogram. |
| LUSTRUM | • lustrum n. (Historical) A lustration: a ceremonial purification of the people of Rome performed every five years… • lustrum n. (By extension, literary) Synonym of quinquennium: Any 5-year period. • LUSTRUM n. (Latin) a period of five years. |
| LYTHRUM | • Lythrum prop.n. A taxonomic genus within the family Lythraceae – certain flowering plants called loosestrife. • LYTHRUM n. any of a genus of plants including loosestrife. |
| NOSTRUM | • nostrum n. A medicine or remedy in conventional use which has not been proven to have any desirable medical effects. • nostrum n. (By extension) An ineffective but favorite remedy for a problem, usually involving political action. • NOSTRUM n. (Latin) any secret, quack or patent medicine; any favourite remedy or scheme. |
| OESTRUM | • oestrum n. Alternative spelling of estrum. • OESTRUM n. (Latin) the period of heat in female mammals, also ESTRUM, ESTRUS, OESTRUS. |
| RASTRUM | • rastrum n. A five-pointed writing implement used to draw parallel lines of a staff in sheet music. • RASTRUM n. (Latin) a music-pen. |
| ROSTRUM | • rostrum n. A dais, pulpit, or similar platform for a speaker, conductor, or other performer. • rostrum n. A platform for a film or television camera. • rostrum n. The projecting prow of a rowed warship, such as a trireme. |
| SISTRUM | • sistrum n. An ancient Egyptian musical instrument, to be shaken, consisting of a metal frame holding percussive metal beads. • SISTRUM n. (Latin) a kind of rattle, consisting of a wooden or metal frame fitted with loose strips of metal and disks which jingled when moved. |
| TANTRUM | • tantrum n. An often childish display or fit of bad temper. • tantrum v. (Intransitive) To throw a tantrum. • TANTRUM n. a fit of rage. |