| aqueductus | Synonym: aqueduct. Origin: L. Fr. Aqua, water, + ductus, a leading, fr. Duco, pp. Ductus, to lead (05 Mar 2000) |
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| aqueductus cerebri | An ependymal-lined canal in the mesencephalon about 20 mm long, connecting the third to the fourth ventricle. Synonym: aqueductus cerebri, aqueduct of cerebrum, aqueductus sylvii, iter a tertio ad quartum ventriculum, sylvian aqueduct. (05 Mar 2000) |
| aqueductus cochleae | A fine canal connecting the perilymphatic space of the cochlea with the subarachnoid space. Synonym: ductus perilymphaticus, aqueductus cochleae, cochlear aqueduct. (05 Mar 2000) |
| aqueductus cotunnii | aqueduct of vestibule |
| aqueductus fallopii | The bony passage in the temporal bone through which the facial nerve passes; the facial canal commences at the internal auditory meatus with the horizontal part which passes at first anteriorly (medial crus of facial canal) then turns posteriorly at the geniculum of the facial canal to pass medial to the tympanic cavity (lateral crus of facial canal); finally, it turns downward (descending part of facial canal) to reach the stylomastoid foramen. Synonym: canalis nervi facialis, aqueductus fallopii, fallopian aqueduct, fallopian canal. (05 Mar 2000) |
| aqueductus sylvii | An ependymal-lined canal in the mesencephalon about 20 mm long, connecting the third to the fourth ventricle. Synonym: aqueductus cerebri, aqueduct of cerebrum, aqueductus sylvii, iter a tertio ad quartum ventriculum, sylvian aqueduct. (05 Mar 2000) |
| aqueductus vestibuli | aqueduct of vestibule |
| aquent | <ecology> Soils with an aquic or peraquic moisture regime and lacking distinct soil horizons in the subsoil, wet entisols. (09 Oct 1997) |
| aqueous | <chemistry> Watery, prepared with water. (18 Nov 1997) |
| aqueous chambers | The combined anterior and posterior chamber's of the eye containing the aqueous humor. See: anterior chamber of eye, posterior chamber of eye. See: anterior segment. (05 Mar 2000) |
| aqueous flare | Tyndall phenomenon observed in the fluid of the anterior chamber of the eye. (05 Mar 2000) |
| aqueous humor | <physiology> A transparent liquid contained in the anterior and posterior chambers of the eye, produced by the ciliary process it passes to the venous system via the canal of Schlemm. (27 Sep 1997) |
| aqueous influx phenomenon | The filling of the aqueous vein, which normally carries blood and aqueous, with aqueous, when the junction of the aqueous vein and the recipient vein is partially occluded. Synonym: Ascher's aqueous influx phenomenon. (05 Mar 2000) |
| aqueous phase | The water portion of a system consisting of two liquid phase's, one mainly water, the other a liquid immiscible with water (e.g., benzene, ether). (05 Mar 2000) |
| aqueous solution | <chemistry> A solution in which water is the dissolving medium or solvent. (09 Jan 1998) |