Rare literary or poetic term for the full moon; in everyday language, 満月 (まんげつ) is used instead.
See also: 満月
In old waka poetry, the expression 円月 is sometimes used.
Compound of 円 (えん, 'round') and 月 (げつ, 'moon'). The exact origin is uncertain, but it appears in classical Japanese texts as a poetic term.