implumis

The _bipes implumis_, on the contrary, was hatched nude, without even the embryo of a pin-feather.

The Atlantic Monthly, Volume 02, No. 08, June 1858 Various

Hence, in the wanton destruction of the robin and other insectivorous birds, the bipes implumis, the featherless biped, man, is not only exchanging the vocal orchestra which greets the rising sun for the drowny beetle's evening drone, and depriving his groves and his fields of their fairest ornament, but he is waging a treacherous warfare on his natural allies [98].

Earth as Modified by Human Action, The~ Chapter 02 (historical) 1874

Absolute sir, and most obsolete Roman, doubtless you never had the luck to set eyes upon a turkey at Christmas; the poor bare _bipes implumis_, a forked creature, waiting to be forked supererogatively; ay, and _risibilis_ to boot, if ever all concomitants of the hearty old festival were properly provocative of decent mirth.

An Author's Mind : The Book of Title-pages Martin Farquhar Tupper 1849

Absolute sir, and most obsolete Roman, doubtless you never had the luck to set eyes upon a turkey at Christmas; the poor bare _bipes implumis_, a forked creature, waiting to be forked supererogatively; ay, and _risibilis_ to boot, if ever all concomitants of the hearty old festival were properly provocative of decent mirth.

The Complete Prose Works of Martin Farquhar Tupper Martin Farquhar Tupper 1849

Hence, in the wanton destruction of the robin and other insectivorous birds, the bipes implumis, the featherless biped, man, is not only exchanging the vocal orchestra which greets the rising sun for the drowny beetle's evening drone, and depriving his groves and his fields of their fairest ornament, but he is waging a treacherous warfare on his natural allies.

The Earth as Modified by Human Action George P. Marsh 1841

ouaque maternus rupit hiulca tepor, protinus implumis conuertit ad aethera nidos5

An Eagle of Roman Song Claudian 1912