In anatomy, relating to the calcaneum or heel-bone: as, calcaneal arteries, ligaments, etc.In ornithology, of or pertaining to the back upper part of the tarsometatarsus (tarsus of ordinary language) of a bird, where there is often a tuberosity regarded by some ornithologists as a calcaneum, and so named by them: as, a calcaneal tubercle; calcaneal tuberosity. See cut under tarsometatarsus.