WordReference Random House Unabridged Dictionary of American English © 2019
cy•ma•ti•um  (si māshē əm, sī-),USA pronunciation n., pl.  -ti•a (si māshē əm, sī-),USA pronunciation [Archit.]
  1. Architecturethe uppermost member of a classical cornice or of a cornice of similar form: usually a cyma recta in classical examples. Cf. sima2.
  2. Architectureechinus (def. 2c).
  • Greek kȳmátion, equivalent. to kȳmat- (stem of kŷma wave; see cyma) + -ion diminutive suffix
  • Latin
  • 1555–65

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