·noun The terminal part of the large intestine;
— so named because supposed by the old anatomists to be straight. ·see ·Illust. under Digestive.
rēctum ī, n P. n. of rego, good, uprightness, rectitude, virtue : illud rectum, quodκοτόρθωμαdiceb...
An Elementary Latin Dictionary
·- The line drawn through a focus of a conic section parallel to the directrix and terminated both w...
Webster's Dictionary of the English Language