The Collaborative International Dictionary
Psilopaedic
Psilopaedic \Psi`lo*p[ae]d"ic\, a. (Zo["o]l.) Having down upon the pteryl[ae] only; -- said of the young of certain birds.
Wiktionary
psilopaedic
a. (context zoology English) Having down upon the pterylae only; said of the young of certain birds.