Definition of afterfeather in English:

afterfeather

noun

Ornithology
  • A secondary structure attached to the undersurface of the shaft of a contour feather, typically resembling a smaller and downier feather; also called hyporachis.

Origin

1930s; earliest use found in Science. From after- + feather.

Pronunciation:

afterfeather

/ˈaftəˌfɛðə//ˈɑːftəˌfɛðə/