noun
Refers to a shape resembling a crescent moon. Often used in technical or descriptive contexts.
その湖は彎月状をしている。
The lake has a crescent shape.
Compound of 彎 (わん, 'curve') + 月 (げつ, 'moon') + 状 (じょう, 'shape'). The exact historical derivation is uncertain, but the components clearly indicate 'curved moon shape'.