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Entry 1 sense Webster, 1913

Rhaetic

· Rhae·tic · IPA
01 a. Pertining to, or of the same horizon as, certain Mesozoic strata of the Rhetian Alps. These strata are regarded as closing the Triassic per…
  1. 1.
    Pertining to, or of the same horizon as, certain Mesozoic strata of the Rhetian Alps. These strata are regarded as closing the Triassic period. See the Chart of Geology.(Geol.) See: Geology