noun
something extremely light; trifle
Figurative use emphasizing extreme lightness or insignificance. Often appears in the set phrase 鴻毛の軽き (こうもうのかろき) meaning 'as light as a feather'.
彼の命は鴻毛の軽きに等しいとされた。
His life was regarded as light as a feather.
noun
feather of a large bird
Original literal meaning; now rare outside classical or explanatory contexts.
「鴻毛」は文字通りには大きな鳥の羽を指す。
Literally, 鴻毛 refers to the feather of a large bird.