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Periodoscope :: Periodoscope (n.) A table or other means for calculating the periodical functions of women.

Formation :: Formation (n.) A group of beds of the same age or period; as, the Eocene formation..

Chazy Epoch :: Chazy epoch () An epoch at the close of the Canadian period of the American Lower Silurian system; -- so named from a township in Clinton Co., New York. See the Diagram under Geology..

Permian :: Permian (n.) The Permian period. See Chart of Geology.

Review :: Review (n.) A periodical containing critical essays upon matters of interest, as new productions in literature, art, etc..

Potsdam Group :: Potsdam group () A subdivision of the Primordial or Cambrian period in American geology; -- so named from the sandstone of Potsdam, New York. See Chart of Geology..

Hebdomad :: Hebdomad (n.) A week; a period of seven days.

Oestrual :: Oestrual (a.) Of or pertaining to sexual desire; -- mostly applied to brute animals; as, the oestrual period; oestrual influence..

Olympiad :: Olympiad (n.) A period of four years, by which the ancient Greeks reckoned time, being the interval from one celebration of the Olympic games to another, beginning with the victory of Cor/bus in the foot race, which took place in the year 776 b.c.; as, the era of the olympiads..

Rheotome :: Rheotome (n.) An instrument which periodically or otherwise interrupts an electric current.

Drachma :: Drachma (n.) A silver coin among the ancient Greeks, having a different value in different States and at different periods. The average value of the Attic drachma is computed to have been about 19 cents..

Sevennight :: Sevennight (n.) A week; any period of seven consecutive days and nights. See Sennight.

Limit :: Limit (v. t.) That which terminates a period of time; hence, the period itself; the full time or extent..

Incubation :: Incubation (n.) The development of a disease from its causes, or its period of incubation. (See below.).

Journal :: "Journal (a.) A newspaper published daily; by extension, a weekly newspaper or any periodical publication, giving an account of passing events, the proceedings and memoirs of societies, etc..

Saturnalia :: Saturnalia (n. pl.) The festival of Saturn, 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..

Menopause :: Menopause (n.) The period of natural cessation of menstruation. See Change of life, under Change..

Octennial :: Octennial (a.) Happening every eighth year; also, lasting a period of eight years..

Decussated :: Decussated (a.) Consisting of two rising and two falling clauses, placed in alternate opposition to each other; as, a decussated period..

Algol :: Algol (n.) A fixed star, in Medusa's head, in the constellation Perseus, remarkable for its periodic variation in brightness..

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