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<!-- from webster Latus rectum (Page: 833) La"tus rec"tum (?). [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. Rectum (Page: 1202) Rec"tum (-t?m), 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. -->