any vertebrate having four limbs or, as in the snake and whale, having had four-limbed ancestors.
, as a caltrop, having four projections radiating from one central node, with each forming an angle of 120° with any other, so that no matter how the object is placed on a relatively flat surface, three of the projections will
form a supporting tripod and the fourth will point directly upward.
having four limbs or descended from four-limbed ancestors.
< Neo-Latin tetrapodus
< Greek tetrapod-
(stem of tetrápous
) four-footed. (see tetra-
) + Neo-Latin -us