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The Collaborative International Dictionary of English v.0.48:

Rhaetic \Rhae"tic\, a. [L. Rhaeticus Rhetian.] (Geol.) 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. [1913 Webster]