Os-mo´sis. The passage of a fluid through a membrane.

O´va. Latin plural of ovum, egg.

O´vu-la´´tion. The formation and discharge of an unimpregnated ovum from the ovary.

O´vule. 1. The ovum within the Graafian vesicle. 2. Any small egg-like structure.

O´vum. 1. An egg. 2. The female reproductive cell which, after fertilization, develops into a new member of the same species.

Ox´y-di´´zer. Anything that combines with oxygen.

Pal-pa´tion. The act of feeling with the hand; the application of the fingers with light pressure to the surface of the body for the purpose of determining the consistence of the parts beneath in physical diagnosis.

Par-al´y-sis, Erb’s. 1. Same as birth-palsy. 2. Partial paralysis of the brachial plexus affecting various muscles of the arm and chest-walls. It is revealed by an inability to lift the arm toward the head.

Par-al´y-sis facial (Bell’s). Paralysis of the face, due to lesion of the facial nerve or of its nucleus.

Par´a-me-tri´´tis. Inflammation of the parametrium, or cellular tissue about the uterus.