fifth degree of the pentatonic scale
Refers to the fifth note in the traditional Japanese and Chinese pentatonic scale (五音). This is a technical music term.
See also: 五音
Among the five notes of the pentatonic scale, 羽 is the fifth degree.
emergence; eclosion; growing wings
molting; moulting
bird's crest; crest (of a bird)
aftershaft; afterfeather
The character 羽 (feather) is used as a label for the fifth note in the traditional pentatonic scale; the reason for this association is uncertain.