| ACTINOURANIUM | • actinouranium n. Alternative spelling of actino-uranium. • actino-uranium n. Uranium-235. • ACTINOURANIUM n. the isotope of uranium that has a mass number of 235. |
| INAUGURATIONS | • inaugurations n. Plural of inauguration. • INAUGURATION n. an act of inaugurating. |
| INCUNABULISTS | • incunabulists n. Plural of incunabulist. • INCUNABULIST n. a student of incunabula. |
| INFUNDIBULATE | • infundibulate adj. Shaped like a funnel; infundibulated or infundibular. • INFUNDIBULATE adj. funnel-shaped, also INFUNDIBULAR. |
| INVULTUATIONS | • INVULTUATION n. the stabbing of a wax image of person to be injured as form of witchcraft. |
| MAGNITUDINOUS | • magnitudinous adj. Having (great) magnitude. • MAGNITUDINOUS adj. having magnitude. |
| QUINQUIVALENT | • quinquivalent adj. (Chemistry) Having an atomic valence of 5. • quinquivalent adj. (Medicine) Having a vaccine valence of 5. • QUINQUIVALENT adj. having a valency of five, also QUINQUEVALENT. |
| TINTINNABULUM | • tintinnabulum n. A small clinking bell, particularly (historical) a small bell used to call monks to certain tasks. • tintinnabulum n. A set of bells or metal plates used as a musical instrument or as a toy. • TINTINNABULUM n. a usually high-pitched bell; a bell-rattle. |
| UNACQUAINTING | • UNACQUAINT v. to deprive (a person) of awareness or acquaintance. |
| UNDULATIONIST | • undulationist n. (Archaic) One who believes that light is a wave. • UNDULATIONIST n. someone who holds the undulatory theory of light. |
| UNILINGUALIST | • UNILINGUALIST n. a supporter of unilingualism. |
| UNILLUMINATED | • unilluminated adj. Not illuminated. • UNILLUMINATED adj. not illuminated. |
| UNINFLUENTIAL | • uninfluential adj. Not influential; lacking influence. • UNINFLUENTIAL adj. not influential. |