(anatomy) The terminal part of the large intestine through which feces pass after exiting the colon, but before leaving the body through the anus.

plural of rectum

(geometry) 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.

(grammar) The second of the two nouns in status constructus, which occurs in its phonetically full form or status absolutus.

(somewhat dated) A straight seminiferous tubule conveying semen from its pertaining tubulus seminiferus contortus (convoluted seminiferous tubule) to the rete testis of the testicle that contains it; now more commonly called the tubulus seminiferus rectus (straight seminiferous tubule).

(rare) = cyma recta

plural of latus rectum

(medicine) By or through the rectum, as (usually, more specifically) the rectal route of administration for drugs.