Entry 1 sense Webster, 1913 Psilopædes · Psi·lo·pæ·des · IPA 01 n. pl. birds whose young at first have down on the pterylæ only; -- called also Gymnopædes. 1. birds whose young at first have down on the pterylæ only; -- called also Gymnopædes.(Zool.) Also: Gymnopædes