/si may"shee euhm, suy-/ , n. , pl. cymatia /-shee euh/ . Archit.
1. the uppermost member of a classical cornice or of a cornice of similar form: usually a cyma recta in classical examples. Cf. sima 2 .
2. echinus (def. 2c).
[ 1555-65; kymátion, equiv. to kymat- (s. of kyma wave; see CYMA) + -ion dim. suffix ]