Meaning of neossoptile in English:

neossoptile

Pronunciation /ˌnɪəˈsɒptʌɪl/ /nɪˈɒsɒptʌɪl/

noun

Ornithology
  • Any of the soft or downy feathers of a juvenile bird. Often contrasted with teleoptile.

Origin

Late 19th century; earliest use found in Alfred Newton (1829–1907), zoologist. From ancient Greek (non-Attic) νεοσσός a young bird + -ptile.