Rectal

(rek' -tal). Pertaining to the rectum. R. Etherization. See Anesthetic . R. Glands. From two to six projecting glandular bodies in the rectum of many insects (Orthoplera, Diplera). In certain larvse (Libellula aschna) they take the form of respiratory organs. R. Pouch, of rays and sharks, a dorsal diverticle of the rectum characteristic of the group.