=Ob-stet´rics.= The art of managing childbirth cases; that branch of surgery which deals with the management of pregnancy and labor. =Ob-ste-tri´cian.= One who practices obstetrics. =Oc´ci-put.= The back part of the head. =Ol´i-go-hy-dram´´ni-os.= Scantiness of the liquor amnii. =Ol´i-gop-nœ´´a.= A delay following the birth of a child before the first respiration is established. =Oph-thal´mi-a.= Severe inflammation of the eye or of the conjunctiva. =Or´gan.= Any part of the body having a special function. =Os.= (_L._, a mouth.) The orifice in the uterus or vagina. =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. =Par´a-phi-mo´´sis.= Retraction of a narrow or inflamed foreskin which can not be replaced. =Pa-ren´chy-ma.= The essential or functional elements of an organ as distinguished from its stroma or framework. =Pa-ri´e-tal.= Of, or pertaining to, the walls of a cavity. =Par´o-nych´´i-a.= Infection and suppuration about the junction of nails and skin. =Par´ox-ysm.= A sudden recurrence or sudden intensification of symptoms. =Path-o-log´ic.= Pertaining to pathology. =Pa-thol´o-gy.= That branch of medicine which treats of the essential nature of disease, especially of the structural and functional changes caused by disease. =Pel-vim´e-ter.= An instrument for measuring the various diameters of the pelvis. =Pel-vim´e-try.= The act of determining the dimensions of the pelvis by means of a pelvimeter. =Per´i-ne-or´´rha-phy.= Suturation of the perineum, performed for the repair of a laceration. =Per´i-ne´´um.= The space or area between the anus and the genital opening. =Pe-riph´e-ry.= The outward part or surface. =Per´i-to-ne´´um.= The serous membrane which lines the abdominal walls. =Per´i-to-ni´´tis.= Inflammation of the peritoneum.