psilopaedes

from The Century Dictionary.

• In ornithology, in Sundevall's system (1872), a primary group of birds, embracing those which are hatched naked and require to be fed in the nest by the parent

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) birds whose young at first have down on the pterylæ only; -- called also Gymnopædes.