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Ichthyosauria :: Ichthyosauria (n. pl.) An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period..

Latterly :: Latterly (adv.) Lately; of late; recently; at a later, as distinguished from a former, period..

Antique :: Antique (a.) Old, as respects the present age, or a modern period of time; of old fashion; antiquated; as, an antique robe..

Round :: Round (n.) A series of changes or events 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..

Magazine :: Magazine (n.) A pamphlet published periodically containing miscellaneous papers or compositions.

Devonian :: Devonian (a.) Of or pertaining to Devon or Devonshire in England; as, the Devonian rocks, period, or system..

Epoch :: Epoch (n.) A division of time characterized by the prevalence of similar conditions of the earth; commonly a minor division or part of a period.

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..

Periodical :: Periodical (a.) Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun..

Trilobite :: Trilobite (n.) Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment..

Teleosaurus :: Teleosaurus (n.) A genus of extinct crocodilian reptiles of the Jurassic period, having a long and slender snout..

Mars :: Mars (n.) One of the planets of the solar system, the fourth in order from the sun, or the next beyond the earth, having a diameter of about 4,200 miles, a period of 687 days, and a mean distance of 141,000,000 miles. It is conspicuous for the redness of its light..

Decade :: Decade (n.) A group or division of ten; esp., a period of ten years; a decennium; as, a decade of years or days; a decade of soldiers; the second decade of Livy..

Kalpa :: Kalpa (n.) One of the Brahmanic eons, a period of 4,320,000,000 years. At the end of each Kalpa the world is annihilated..

Epitasis :: Epitasis (n.) The period of violence in a fever or disease; paroxysm.

Dog Days :: Dog days () A period of from four to six weeks, in the summer, variously placed by almanac makers between the early part of July and the early part of September; canicular days; -- so called in reference to the rising in ancient times of the Dog Star (Sirius) with the sun. Popularly, the sultry, close part of the summer..

Snatch :: Snatch (n.) A short period of vigorous action; as, a snatch at weeding after a shower..

Saturn :: Saturn (n.) One of the planets of the solar system, next in magnitude to Jupiter, but more remote from the sun. Its diameter is seventy thousand miles, its mean 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..

Annals :: Annals (n. pl.) A periodic publication, containing records of discoveries, transactions of societies, etc.; as Annals of Science..

Beat :: Beat (n.) A sudden swelling or reenforcement of a sound, recurring at regular intervals, and produced by the interference of sound waves of slightly different periods of vibrations; applied also, by analogy, to other kinds of wave motions; the pulsation or throbbing produced by the vibrating together of two tones not quite in unison. See Beat, v. i., 8..

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