Porphyrio, porphyriônis, pen. prod. f. ge. Plin. A birde drinking as though he did bite the water, and hath long red legs and bill.
Lewis and Short: Latin dictionary
porphrĭo, ōnis, m., = porfuri/wn, a species of water-fowl, the sultana-hen, porphyrton (Fulica porphyrio, Linn.), Plin. 10, 16, 63, 129; Vulg. Lev. 11, 18.