vestibulate (vestibulat)

[ In the intention of the early builders of the church, the vestibule, or atrium, was regarded as that portion of the sacred building which was appropriated to those who had not been received into the full standing of members of the Church of Christ. C. E. Norton, Travel and Study in Italy, p. 186. 2. In an at .: ( a ) A part of the labyrinth of the ear, the common or central cavity, between the semicircular canals and the cochlea, communicating permanently with the former, and temporarily or permanently with the latter, from the proper membranous cavity of which it is generally shut off subsequently, opening into the tympanum or middle ear by the fenestra oval is, which, however, is closed in life by a membrane. See cuts under earl and temporal . (b) A triangular space between the nymphæ or labia mi 6741 nor a of the human female and some anthropoid apes, containing the orifice of the urethra, or meatus urinarius. More fully called vestibule of the vulva and vestibulum vag inæ. (c) A part of the left ventricular cavity of the heart, adjoining the root of the aorta.-3. In zool.: (a) A depre ion of the body-wall of sundry infusorians, as Paramecium and Noctiluca, leading to the oral and sometimes also to the anal aperture, and thus connected, by means of an esophageal canal, with the endosarc. See Vorti cella, Noctiluca, and cut under Paramecium. (b) In polyzoans, an outer chamber of a cell of the polyzoary, which opens on the surface, and into which, in some forms, the pharynx and anus both open. - Aortic vestibule. See aortic. - Common sinus of the vestibule. Same as utricle, 2.-Membranous vestibule, the membranous sac contained within the o eous vestibule, in some animals, as in man, divided into a larger section, the utricle or utriculus, and a le er, the saccule or sacculus. - O eous vestibule, the bony cavity in the petrosal bone, in nearly all ver tebrates inclosed by the proötic, epiotic, and opisthotic bones, and inclosing the membranous vestibule. - Pyramid of the vestibule. See pyramid. - Utricle of the vestibule. See utricle. - Vestibule of the larynx, that part of the laryngeal cavity which lies above the false vocal cords. Vestibule of the mouth, the cavity of the mouth outside of the teeth, technically called vestibulum or is. - Vestibule of the pharynx, the fauces; the pa age from the mouth to the pharynx, bounded laterally by the pillars of the fauces. - Vestibule of the vulva. See def. 2 (b). Vestibule train. See vestibule, v. t. = Syn. 1. See definitions of porch, portico, hall, lobby, pa age. vestibule (ves'ti-bul), v. t.; pret. and pp. ves tibuled, ppr. vestibuling. [ vestibulum (ves-tib'ū-lum), n.; pl. vestibula (-lä). [NL.: see vestibule.] In an at. and zoöl., a vestibule. - Aqueduct us vestibuli. See aquæduct us. Pyramis vestibuli. See pyramis. - Scala vestibuli. See scala.- Utriculus vestibuli. Same as utricle, 2.Vestibulum or is, the vestibule of the mouth (which see, under vestibule ). - Vestibulum vag inæ. Same as vest i bule, 2 ( b ).