You searched for: “lunar calendar”
lunar calendar (s) (noun), lunar calendars (pl)
A measure of the year based on twelve lunar months: The lunar calendar is formed by employing the time it takes the Moon to revolve around the Earth), which lasts about 354.37 days.
This entry is located in the following units: Astronomy and related astronomical terms (page 15) Science and Technology Words from the Ancient Past to the Present, Part 1 (page 4)