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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.

Having no crisis; giving no indications of a crisis; as, acritical symptoms, an acritical abscess.

Communicated orally; oral; -- applied to the esoteric teachings of Aristotle, those intended for his genuine disciples, in distinction from his exoteric doctrines, which were adapted to outsiders or the public generally. Hence: Abstruse; profound.

Same as Acroamatic.

Pertaining to an acrobat. -- Ac`ro*bat"ic*al*ly, adv.

Having each verse begin with the same letter as that with which the preceding verse ends.

e letters of the alphabet in regular order (as Psalm cxix.). See Abecedarian. Double acrostic, a species of enigma, in which words are to be guessed whose initial and final letters form other words.

Pertaining to, or characterized by, acrostics.

After the manner of an acrostic.

The end of a verse or psalm, or something added thereto, to be sung by the people, by way of a response.

Pertaining to or affecting the surface.

Of the nature of, or containing, actinolite.

Not giving out or receiving heat. -- Ad`i*a*bat`ic*al*ly, adv. Adiabatic line or curve, a curve exhibiting the variations of pressure and volume of a fluid when it expands without either receiving or giving out heat. Rankine.

Pertaining to matters indifferent in faith and practice. Shipley.

tral fats into glycerin and free fatty acids, esp. by the action of an enzyme; as, adipolytic action.

Of or pertaining to a sea so named, the northwestern part of which is known as the Gulf of Venice.

Related to, or of the nature of, aërobies; as, aërobiotic plants, which live only when supplied with free oxygen.

The science of gliding and soaring flight.

Of or pertaining to aërolites; meteoric; as, aërolitic iron. Booth.

Pertaining to aëronautics, or aërial sailing.