psilopaedic
/ˌsʌɪlə(ʊ)ˈpiːdɪk/(also psilopedic) Ornithology rare
adjective
Of a bird: hatched without a covering of down. Contrasted with ptilopaedic.
Origin
Late 19th century; earliest use found in Elliott Coues (1842–1889), naturalist and historian. From psilo- + ancient Greek παιδ-, παῖς child + -ic, after scientific Latin psilopaedes.