| acoustic tubercle | The slight prominence of the floor of the lateral recess of the fourth ventricle, corresponding to the underlying cochlear and vestibular nuclei. Synonym: acoustic tubercle, trigonum acustici. (05 Mar 2000) |
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| acoustic vesicle | One of the paired sacs of invaginated ectoderm that develop into the membranous labyrinth of the internal ear. Synonym: acoustic vesicle, otic vesicle. (05 Mar 2000) |
| acousticofacial crest | The part of the neural crest from which the ganglia of the seventh and eighth cranial nerves develop. (05 Mar 2000) |
| acousticofacial ganglion | A primordial ganglionic cell mass in young embryos which later separates into the acoustic or spiral ganglion of the vestibulocochlear (eighth cranial) nerve and the geniculate ganglion of the facial (seventh cranial) nerve. (05 Mar 2000) |
| acousticopalpebral reflex | A form of the wink reflex in which there is a contraction, sometimes very slight, of the orbicularis palpebrarum muscle when a sudden noise is made close to the ear; it is absent in labyrinthine disease with total deafness. Synonym: acousticopalpebral reflex, auropalpebral reflex, cochleo-orbicular reflex, startle reflex. (05 Mar 2000) |
| acousticophobia | <psychology> Morbid fear of sounds. Origin: G. Akoustikos, acoustic, + phobos, fear (05 Mar 2000) |
| acoustics | <physics> The science of sounds, teaching their nature, phenomena, and laws. "Acoustics, then, or the science of sound, is a very considerable branch of physics." (Sir J. Herschel) The science is, by some writers, divided, into diacoustics, which explains the properties of sounds coming directly from the ear; and catacoustica, which treats of reflected sounds or echoes. Origin: Names of sciences in -ics, as, acoustics, mathematics, etc, are usually treated as singular. See -ics. Source: Websters Dictionary (01 Mar 1998) |
| Aconitum |
(Ac
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| acoprosis |
(acop
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| acoprous |
(acop
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| acorn |
(acorn) (a
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| ACOS |
(ACOS) American College of Osteopathic Surgeons.
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