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Pertaining to, derived from, or designating, the highest oxygen acid (HIO

Of or pertaining to a period or periods, or to division by periods. The periodicaltimes of all the satellites. Sir J. Herschel.

A magazine or other publication which appears at stated or regular intervals.

One who publishes, or writes for, a periodical.

In a periodical manner.

Periodicity.

The quality or state of being periodical, or regularly recurrent; as, the periodicity in the vital phenomena of plants. Henfrey.

A remedy possessing the property of preventing the return of periodic paroxysms, or exacerbations, of disease, as in intermittent fevers.

A small periodical change of position in the stars and other heavenly bodies, due to the combined effect of the motion of light and the motion of the observer; called annual aberration, when the observer's motion is that of the earth in its orbit, and dairy or diurnal aberration, when of the earth on its axis; amountin…

A fixed star, in Medusa's head, in the constellation Perseus, remarkable for its periodic variation in brightness.

A current which periodically changes or reverses its direction of flow.

A periodic publication, containing records of discoveries, transactions of societies, etc.; as "Annals of Science."

f anomaly, or from any point in its elliptic orbit to the same again. -- Anomalistic, or Periodical year. See under Year.

The periodical sessions of the judges of the superior courts in every county of England for the purpose of administering justice in the trial and determination of civil and criminal cases; -- usually in the plural. Brande. Wharton. Craig. Burrill.

A building or an apartment where a library, periodicals, and newspapers are kept for use.

The editor of a periodical. [Obs.]

the bark of the bebeeru, or green heart of Guiana (Nectandra Rodioei). It is a tonic, antiperiodic, and febrifuge, and is used in medicine as a substitute for quinine. [Written also bibirine.]

A periodic coment, discovered by Biela in 1826, which revolves around the sun in 6.6 years. The November meteors (Andromedes or Bielids) move in its orbit, and may be fragments of the comet.

A periodical publication, especially one containing the proceeding of a society. Bulletin board, a board on which announcements are put, particularly at newsrooms, newspaper offices, etc.

The act of moving or revolving around, or as in a circle or orbit; a revolution; as, the periodical circuit of the earth round the sun. Watts.