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Megrim :: Megrim (n.) A kind of sick or nevrous headache, usually periodical and confined to one side of the head..

Niagara Period :: Niagara period () A subdivision or the American Upper Silurian system, embracing the Medina, Clinton, and Niagara epoch. The rocks of the Niagara epoch, mostly limestones, are extensively distributed, and at Niagara Falls consist of about eighty feet of shale supporting a greater thickness of limestone, which is gradually undermined by the removal of the shale. See Chart of Geology..

Hebdomadally :: Hebdomadally (adv.) In periods of seven days; weekly.

Revival :: Revival (n.) Renewed interest in religion, after indifference and decline; a period of religious awakening; special religious interest..

Aeon :: Aeon (n.) A period of immeasurable duration; also, an emanation of the Deity. See Eon..

Always :: Always (adv.) Constancy during a certain period, or regularly at stated intervals; invariably; uniformly; -- opposed to sometimes or occasionally..

Distance :: Distance (n.) Length or interval of time; period, past or future, between two eras or events..

Pallas :: Pallas (n.) Pallas Athene, the Grecian goddess of wisdom, called also Athene, and identified, at a later period, with the Roman Minerva..

Heliostat :: Heliostat (n.) An instrument consisting of a mirror moved by clockwork, by which a sunbeam is made apparently stationary, by being steadily directed to one spot during the whole of its diurnal period; also, a geodetic heliotrope..

Primordial :: Primordial (a.) Of or pertaining to the lowest beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian..

Term :: Term (n.) In universities, schools, etc., a definite continuous period during which instruction is regularly given to students; as, the school year is divided into three terms..

Period :: Period (n.) A complete sentence, from one full stop to another; esp., a well-proportioned, harmonious sentence..

Ephemeris :: Ephemeris (n.) A collective name for reviews, magazines, and all kinds of periodical literature..

Time :: Time (n.) The period at which any definite event occurred, or person lived; age; period; era; as, the Spanish Armada was destroyed in the time of Queen Elizabeth; -- often in the plural; as, ancient times; modern times..

Archaean :: Archaean (n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life..

Oestrus :: Oestrus (n.) A vehement desire; esp. (Physiol.), the periodical sexual impulse of animals; heat; rut..

Limuloidea :: Limuloidea (n. pl.) An order of Merostomata, including among living animals the genus Limulus, with various allied fossil genera, mostly of the Carboniferous period. Called also Xiphosura..

Periodical :: Periodical (n.) A magazine or other publication which appears at stated or regular intervals.

Millennialist :: Millennialist (n.) One who believes that Christ will reign personally on earth a thousand years; a Chiliast; also, a believer in the universal prevalence of Christianity for a long period..

Millennial :: Millennial (a.) Of or pertaining to the millennium, or to a thousand years; as, a millennial period; millennial happiness..

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