‖pos>n. [ L., the right side. ] (Conic Sections) The line drawn through a focus of a conic section parallel to the directrix and terminated both ways by the curve. It is the parameter of the principal axis. See Focus, and Parameter. [ 1913 Webster ]
‖n. [ Meso- + rectum. ] (Anat.) The fold of peritoneum, or mesentery, attached to the rectum. --
n. [ NL. (sc. intestinum), fr. L. rectus straight. See Right. ] (Anat.) The terminal part of the large intestine; -- so named because supposed by the old anatomists to be straight. See Illust. under Digestive. [ 1913 Webster ]