featherless biped

Etymology
From, from the dialogue The Statesman by (427–347 ): “λέγω δὴ δεῖν τότε εὐθὺς τὸ πεζὸν τῷ δίποδι πρὸς τὸ τετράπουν γένος διανεῖμαι, κατιδόντα δὲ τἀνθρώπινον ἔτι μόνῳ τῷ πτηνῷ συνειληχὸς τὴν δίποδα ἀγέλην πάλιν τῷ ψιλῷ καὶ τῷ πτεροφυεῖ τέμνειν,  [I say, then, that we ought at that time to have divided walking animals immediately into biped and quadruped, then seeing that the human race falls into the same division with the feathered creatures and no others, we must again divide the biped class into featherless and feathered,]”.

Noun

 * 1)  A human being.

Usage notes

 * Used throughout the history of western philosophy as an example of an unsatisfactory definition of the term.