‖n. [ NL., fr. Gr. &unr_; woody, wooded, muddy; &unr_; a wood + e'i^dos form. ] (Zool.) The piping frog (Hyla Pickeringii), a small American tree frog, which in early spring, while breeding in swamps and ditches, sings with high, shrill, but musical, notes. [ 1913 Webster ]