"four-footed animal, quadruped," 1826, from Modern Latin tetrapodus, from Greek tetrapous "four-footed," as a noun, "four-footed animal," from tetra- "four" (from PIE root *kwetwer- "four") + pous "foot" (from PIE root *ped- "foot").
tetrad
tetragrammaton
tetrahedron
tetralogy
tetrameter
tetrapod
tetrarch
tetter
*teue-
*teuta-
Teuton