Japanese

Noun

翼鏡 ‎(hiragana よくきょう, romaji yokukyō, historical hiragana よくきやう)

1. (ornithology) speculum

References

1. ↑ 2006, 大辞林 (Daijirin), Third Edition (in Japanese), Tōkyō: Sanseidō, ISBN 4-385-13905-9