| 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. |
| BUREAUCRAT | • bureaucrat n. An official who is part of a bureaucracy. • bureaucrat n. (Wikimedia jargon) A wiki user with the right to change user access levels. • BUREAUCRAT n. a member of a bureaucracy. |
| SUBANGULAR | • subangular adj. (Geology) Slightly angular; having rather blunt angles. • SUBANGULAR adj. slightly angular. |
| SUBARCUATE | • subarcuate adj. Having a figure resembling that of a bow; somewhat curved or arched. • SUBARCUATE adj. somewhat arched; with two or more arches under a main arch. |
| 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. |
| UBIQUARIAN | • ubiquarian adj. (Archaic) Ubiquitous. • ubiquarian adj. Alternative form of ubiquitarian. • ubiquarian n. Obsolete form of ubiquitarian. |
| 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. |