coccyx(n = noun.body) tail bone - the end of the vertebral column in humans and tailless apes;
is a kind of bone, os
is a part of back, backbone, rachis, spinal column, spine, vertebral column, hip, pelvic arch, pelvic girdle, pelvis
has parts: caudal vertebra, coccygeal vertebra
Derived form adjective coccygeal1
The end of the vertebral column beyond the sacrum in man and tailless monkeys. It is composed of several vertebræ more or less consolidated. [1913 Webster]
coccyx, n. (pl. coccyges or coccyxes) the small triangular bone at the base of the spinal column in humans and some apes.
Derivative:
coccygeal adj.
Etymology:
L f. Gk kokkux -ugos cuckoo (from being shaped like its bill)