"one of a fabulous race of men believed to live in the tropics and have but one leg with a single enormous foot," 1816, from Modern Latin monopodes, from mono- "single" + pod-, stem of Greek pous "foot" (from PIE root *ped- "foot").
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit pad-, accusative padam "foot;" Avestan pad-; Greek pos, Attic pous, genitive podos; Latin pes, genitive pedis "foot;" Lithuanian padas "sole," pėda "footstep;" Old English fot, German Fuß, Gothic fotus "foot."
<a href="https://www.etymonline.com/word/monopode">Etymology of monopode by etymonline</a>
Harper, D. (n.d.). Etymology of monopode. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/monopode