any vertebrate having four legs or limbs, including the mammals, birds, and reptiles: snakes, whales, etc. are included in this group because they evolved from four-legged animals
Origin of tetrapodtetra- + -pod
- Any of numerous organisms of the group Tetrapoda, usually characterized as those species that have four limbs with digits and those, such as whales and snakes, that are descended from such species. Tetrapoda includes the amphibians, reptiles, birds, and mammals.
- A vertebrate animal with four feet, legs, or leglike appendages.
- Having four limbs or feet
From tetra- ("four") and -pod, from podos ("foot").