1.
half moon
the moon when it appears as a semicircle, either first quarter or last quarter
Compounds
半 (half) + 月 (moon, month)
- 半月板 - meniscus (knee cartilage, named for its half-moon shape)
Related words
- 新月 - new moon
- 三日月 - crescent moon
- 半月 - half moon (the general term for either 上弦 or 下弦)
- 満月 - full moon
- 上弦の月 - first quarter moon
- 下弦の月 - last quarter moon
Watch out
For "half a month" the usual reading is 半月; はんげつ in the time sense is correct but much less common.