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Of or pertaining to a period; constituting a complete sentence. Periodic comet (Astron.), a comet that moves about the sun in an elliptic orbit; a comet that has been seen at two of its approaches to the sun. -- Periodic function (Math.), a function whose values recur at fixed intervals as the variable uniformly incre…

To perform a periodical revolution; to move onward as with a revolution; as, the rolling year; ages roll away.

not be reflected, or polarized, or deflected by a magnetic field. They are regarded as nonperiodic, transverse pulses in the ether. They are used in examining opaque objects, as for locating fractures or bullets in the human body.

vents ending where it began; a series of like events recurring in continuance; a cycle; a periodical revolution; as, the round of the seasons; a round of pleasures.

oss; comprehensively; generally; as, to give numbers roundly. In speaking roundly of this period. H. Morley.

Fullness; smoothness of flow; as, the roundness of a period; the roundness of a note; roundness of tone.

An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.

Successive; one following the other without break or intervention; -- said of periods of time; as, to be away two days running; to sow land two years running.

Sexual desire or oestrus of deer, cattle, and various other mammals; heat; also, the period during which the oestrus exists.

contains beds of salt. The saliferous beds of New York State belong largely to the Salina period of the Upper Silurian. See the Chart of Geology.

A Chaldean astronomical period or cycle, the length of which has been variously estimated from 3,600 years to 3,600 days, or a little short of 10 years. Brande & C.

distance from the sun nearly eight hundred and eighty millions of miles, and its year, or periodical revolution round the sun, nearly twenty-nine years and a half. It is surrounded by a remarkable system of rings, and has eight satellites.

celebrated in December, originally during one day, but afterward during seven days, as a period of unrestrained license and merriment for all classes, extending even to the slaves.

group, whose existence was predicated under the provisional name ekaboron by means of the periodic law, and subsequently discovered by spectrum analysis in certain rare Scandinavian minerals (euxenite and gadolinite). It has not yet been isolated. Symbol Sc. Atomic weight 44

The formation belonging to the middle of the three subdivisions of the Corniferous period in the American Devonian system; -- so called from Schoharie, in New York, where it occurs. See the Chart of Geology.

onsible control of the money appropriated for school purposes. [U.S.] -- School days, the period in which youth are sent to school. -- School district, a division of a town or city for establishing and conducting schools. [U.S.] -- Sunday school, or Sabbath school, a school held on Sunday for study of the Bible and fo…

Hence, a period of time, especially as regards its fitness for anything contemplated or done; a suitable or convenient time; proper conjuncture; as, the season for planting; the season for rest. The season, prime for sweetest scents and airs. Milton.

t little used. -- Secondary syphilis (Med.), the second stage of syphilis, including the period from the first development of constitutional symptoms to the time when the bones and the internal organs become involved. -- Secondary tint, any subdued tint, as gray. -- Secondary union (Surg.), the union of wounds after…

A part of a musical period, composed of one or more phrases. See Phrase.

Pertaining to an age, or the progress of ages, or to a long period of time; accomplished in a long progress of time; as, secular inequality; the secular refrigeration of the globe.