Auctorial, awk′tōr-i-al, adj. of or pertaining to an author or his trade. [L. auctor.]

Audacious, aw-dā′shus, adj. daring: bold: impudent.—adv. Audā′ciously.—ns. Audā′ciousness, Audacity (aw-das′i-ti). [Fr. audacieux—L. audaxaudēre, to dare.]

Audible, awd′i-bl, adj. able to be heard.—ns. Aud′ibleness, Audibil′ity.—adv. Aud′ibly.—n. Aud′ience, the act of hearing: a judicial hearing: admittance to a hearing: a ceremonial interview: an assembly of hearers: a court of government or justice in Spanish America, also the territory administered by it—Sp. audiencia.—adj. Aud′ient, listening: paying attention.—n. a hearer. [L. audibilisaudīre, to hear, conn. with Ger. ous, ōtos, the ear.]

Audiometer, awd-i-om′et-ėr, n. an instrument for measuring and recording differences in the power of hearing.

Audiphone, awd′i-fōn, n. an instrument which is pressed against the upper front teeth, the convex side outwards, in order to communicate sounds to the teeth and bones of the skull, thence to the organs of hearing.

Audit, awd′it, n. an examination of accounts by one or more duly authorised persons: a calling to account generally: a statement of account: (obs.) a periodical settlement of accounts: (obs.) audience, hearing.—v.t. to examine and verify by reference to vouchers, &c.—ns. Audi′tion, the sense of hearing: the act of hearing: (rare) something heard; Aud′itor, a hearer: one who audits accounts:—fem. Aud′itress; Auditōr′ium, in an opera-house, public hall, or the like, the space allotted to the hearers: the reception-room of a monastery; Aud′itorship.—adj. Aud′itory, relating to the sense of hearing.—n. an audience: a place where lectures, &c., are heard.—Audit ale, an ale of special quality brewed for some Oxford and Cambridge colleges; orig. for use on the day of audit. [L. auditus, a hearing—audīre, to hear. See Audible.]

Augean, aw-jē′an, adj. filthy: difficult. [From Augeas, a fabled king of Elis in Greece, whose stalls, containing 3000 oxen, and uncleaned for thirty years, were swept out by Hercules in one day by his turning the river Alpheus through them.]

Auger, aw′gėr, n. a carpenter's tool used for boring holes in wood.—n. Au′ger-bit, an auger that fits into a carpenter's brace (see Brace). [A corr. of nauger, an auger, A.S. nafugárnafu, a nave of a wheel, gár, a piercer. See Nave (of a wheel), Gore, a triangular piece.]

Aught, awt, n. a whit: ought: anything: a part. [A.S. á-wiht, contr. to áht, whence ōht, ōght, and ought. Shakespeare, Milton, and Pope use ought and aught without distinction. Awiht is from á, ó, ever, and wiht, creature, a wight, a thing.]

Augite, aw′jīt, n. one of the Pyroxene group of minerals, closely allied to hornblende, usually of a greenish colour, occurring crystallised in prisms, and forming an essential component of many igneous rocks.—adj. Augit′ic. [Gr. augē, brightness.]