Pronunciation: (si-mā'shē-um, sī-), [key]
—pl. -ti•aPronunciation: (-shē-u). [key] Archit.
1. the uppermost member of a classical cornice or of a cornice of similar form: usually a cyma recta in classical examples. Cf. sima2.
2. echinus (def. 2c).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.