Etymology Borrowed from Latin caudālis (“having a tail”).
1
Biology, Natural sciences, Zoology Pertaining to the tail or posterior or hind part of a body.
The male widow-bird, remarkable for his caudal plumes, […]1871, Charles Darwin, “Principles of Sexual Selection”, in The Descent of Man, and Selection in Relation to Sex. […], volume I, London: John Murray, […], →OCLC, Part II (Sexual Selection), page 269:
Dassoud […] stepped forward with a lash composed of the caudal appendages of half a dozen wildebeests.1982, TC Boyle, Water Music, Penguin, published 2006, page 3:
2
Toward the tail end (hind end) of the body; in bipeds such as humans, this direction corresponds to inferior.