The Collaborative International Dictionary
Vestibulum
Vestibulum \Ves*tib"u*lum\, n.; pl. Vestibula. [L., vestibule.] (Zo["o]l.) A cavity into which, in certain bryozoans, the esophagus and anus open.
Wiktionary
vestibulum
n. (context zoology English) A cavity into which, in certain bryozoans, the esophagus and anus open.
Usage examples of "vestibulum".
An unspoken query was prominent in her mind's vestibulum: Why have you summoned me, Umk'ai?
Her mental barriers had abruptly fallen, and something unusual and very dangerous waited just beyond her passive vestibulum, daring him to inspect it.