tripod (n.) Look up tripod at Dictionary.com
c. 1600, "three-legged vessel," c. 1600, from Latin tripus (genitive tripodis), from Greek tripous (genitive tripodos) "a three-legged stool or table," noun use of adjective meaning "three-footed," from tri- "three" (see tri-) + pous (genitive podos) "foot" (from PIE root *ped- "foot"). Related: Tripodal.