Either of two moldings, cyma recta or cyma reversa, having an undulating or S-shaped profile, used especially in classical architecture. Also called cymatium.
[New Latin cȳma, from Greek kūma, wave, cyma, from kuein, to swell; see keuə- in the Appendix of Indo-European roots.]
(click for a larger image)cyma
top: cyma recta
bottom: cyma reversa
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.