1. Of, involving, caused by, or affecting the moon.
2. Measured by the revolution of the moon.
3. Of or relating to silver.
[Middle English, crescent-shaped, from Old French lunaire, from Latin lūnāris, of the moon, from lūna, moon; see leuk- in the Appendix of Indo-European roots.]
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.