monopode

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A creature having only one foot.
2. n. Botany A monopodium.

Century Dictionary and Cyclopedia

1. Having but one foot.
2. n. Any object supported on one foot only; specifically, one of a fabled race of men having but one leg. These, the Monoscelli or Sciopodes, are described by Pliny (Hist. Nat., viii.) as dwelling in Ethiopia, and as possessing a single foot, so large that it served when held up to shade them from the sun when they lay down to rest.
3. n. In botany, same as monopodium.

Wiktionary

1. n. Someone or something with one foot.

GNU Webster's 1913

1. n. One of a fabulous tribe or race of Ethiopians having but one leg and foot.
2. n. (Bot.) A monopodium.