| ACETABULUM | • acetabulum n. (Anatomy) The bony cup of the pelvis which receives the head of the femur. • acetabulum n. (Zootomy) The cavity in which the leg of an insect is inserted at its articulation with the body. • acetabulum n. (Zootomy) A sucker of the sepia or cuttlefish and related animals. |
| AMBULACRUM | • ambulacrum n. (Of an echinoderm) A row of pores for the protrusion of appendages such as tube feet. • AMBULACRUM n. a radial band in the shell of an echinoderm, bearing rows of pores through which the tube-feet protrude. |
| ARBUSCULAR | • arbuscular adj. (Botany) Similar to a small tree; shrublike. • arbuscular adj. (Mycology) Relating to an arbuscle. • ARBUSCULAR adj. like an arbuscle, a dwarf or shrublike tree. |
| INCUNABULA | • incunabula n. Plural of incunabulum. • INCUNABULUM n. (Latin) a book printed from movable type before 1501, also INCUNABLE. |
| SUBANGULAR | • subangular adj. (Geology) Slightly angular; having rather blunt angles. • SUBANGULAR adj. slightly angular. |
| SUBNATURAL | • subnatural adj. (Physics) Describing spectroscopic lines that are narrower than those produced naturally. • subnatural adj. Below or beneath nature. • SUBNATURAL adj. almost natural. |
| TUBULARIAN | • tubularian n. (Zoology) Any hydroid belonging to the former suborder Tubularida. • tubularian adj. Hydriform in a tubular shape with wide disc. • TUBULARIAN n. any hydroid belonging to the suborder Tubularida. |
| UNAMUSABLE | • unamusable adj. Not amusable. • UNAMUSABLE adj. not able to be amused. |
| UNARGUABLE | • unarguable adj. Not arguable; that cannot be reasonably argued against. • unarguable n. Such a situation. • UNARGUABLE adj. that cannot be disputed. |
| UNARGUABLY | • unarguably adv. Not subject to question or doubt. • UNARGUABLE adv. that cannot be disputed. |
| UNVALUABLE | • unvaluable adj. (Obsolete) Invaluable; beyond price. • unvaluable adj. (Rare) Not valuable; having little value. • UNVALUABLE adj. not valuable. |