pygopod

Century Dictionary and Cyclopedia

1. In ornithology, rump-footed, as an auk, loon, or grebe; having the legs inserted far back, appearing close by the rump; of or pertaining to the Pygopodes.
2. In herpetology, of or pertaining to the Pygopodidæ.
3. n. In herpetology, a lizard of the family Pygopodidæ.

Wiktionary

1. n. zoology One of the Pygopodes.
2. n. zoology Any species of serpentiform lizards of the family Pygopodidae, which have rudimentary hind legs near the anal cleft, but lack forelegs.

GNU Webster's 1913

1. n. (Zoöl.) One of the Pygopodes.
2. n. (Zoöl.) Any species of serpentiform lizards of the family Pygopodidæ, which have rudimentary hind legs near the anal cleft, but lack fore legs.