Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or belonging to the geologic time, system of rocks, or sedimentary deposits of the third period of the Paleozoic Era, characterized by the development of jawed fishes, early invertebrate land animals, and land plants. See Table at geologic time.
  • n. The Silurian Period or its system of deposits.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of a geologic period within the Paleozoic era; comprises the Llandovery, Wenlock, Ludlow and Pridoli epochs from about 439 to 409 million years ago.
  • adj. Of or related to the Silures, a pre-Roman British tribe.
  • proper n. The Silurian period.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to the country of the ancient Silures; -- a term applied to the earliest of the Paleozoic eras, and also to the strata of the era, because most plainly developed in that country.
  • n. The Silurian age.

from The Century Dictionary and Cyclopedia

  • Of or belonging to the Silures, a people of ancient Britain, or their country.
  • In geology, of or pertaining to the Silurian. See II.
  • n. A name given by Murchison, in 1835, to a series of rocks the order of succession of which was first worked out by him in that part of England and Wales which was formerly inhabited by the Silures.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. from 425 million to 405 million years ago; first air-breathing animals

Etymologies

From Latin Silures, an ancient people of southwest Wales, where the rocks were first identified.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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