Rectum. The lower portion of the intestines terminating in the anus.

Recumbent. Reclining.

Reflex action. See pages [93] and [99].

Regurgitation. The act by which blood is forced backwards in an unnatural manner.

Remission. A temporary diminution of the symptoms of fever.

Reproduction. Producing living bodies similar to the parents.

Resolution. The disappearance of inflammation without suppuration.

Respiration. The function by which the blue blood is converted into red blood in the lungs.

Respirator. Described on [page 230].

Retina. Defined on [page 107].