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Definition of: Triassic
(trī·as′ik) adjective Geol.
Of or pertaining to the lowest of the three geological periods comprised in the Mesozoic era.
—n The Triassic period or rock system, following the Permian and succeeded by the Jurassic. Also Tri·as (trī′əs). [<LL trias. See TRIAD.]
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