_Os._--Mouth. Used as mouth of womb. _Osmosis._--Transudation of fluids through membrane. _Osseous._--Bony. _Ova._--Plural of egg. _Ovary._--Almond-shaped body in which the ova are developed. _Oviducts._--Tubes which convey the ova from ovaries to uterus. _Ovum._--An egg. _Oxygenation._--The process of combining with oxygen. _Parietes._--Walls of a cavity. _Parturition._--Childbirth. _Pathological._--Morbid, diseased. _Peritoneal._--Pertaining to the peritoneum. _Perineum._--The floor of the pelvis, or space between and including the anus and vulva. _Peristaltic._--The peculiar worm-like movement of the intestines. _Peritoneum._--A membrane lining the walls and organs of the abdomen. _Peritonitis._--Inflammation of lining membrane of bowels. _Pelvic._--Pertaining to the lower part of the abdomen or pelvis. _Phytolacca._--Pokeroot. _Placebo._--A remedy to gratify the patient. _Placenta._--The after-birth. _Placenta Previa._--Placenta presenting before child-birth. _Plethoric._--Full habit. Fleshy. _Podophyllum._--Mandrake. May apple. _Portal circulation._--Venous circulation of blood from the digestive organs to the liver. _Post partum._--Subsequent to childbirth. _Primapara._--Woman who has brought forth her first child. _Prognosis._--Prediction of the termination of a disease. _Prolapsus._--Falling. Protrusion. _Prolapsus ani._--Protrusion of the rectum. _Prolapsus uteri._--Falling of the womb. _Prolification._--Generation of offspring. _Pubes._--External part of the organs of generation covered with hair. _Pubic._--Pertaining to the pubes. _Puerperal._--Belonging to or consequent upon childbirth. _Pulmonary._--Pertaining to the lungs. _Pulsatilla Nigricans._--Wind flower. _Purulent._--Consisting of pus. _Pruritus._--A skin trouble characterized by intense itching. _Pyemia._--Poisoned by absorption of pus. _Radial._--Belonging to the radius, one of the bones of the fore-arm. _Rectum._--Lower portion of intestines. _Renal._--Pertaining to the kidneys. _Retroversion._--Falling backward. _Retroverted._--Bent backward. _Rigor._--Chilliness. Convulsive shuddering. _Sacral._--Pertaining to the sacrum, the large, triangular bone near the end of the spinal column. _Saline._--Salty. _Salivation._--Unnatural flow of saliva. _Sanative._--Health producing. _Sanguineous._--Bloody. _Sanguinaria._--Blood root. _Sanious._--Secretion tinged with blood. _Sciatic._--Pertaining to the hip. _Sebaceous._--Secreting fatty matter. _Sedative._--Quieting. Soothing. _Sedular._--Pertaining to seed. _Sedular absorption._--Absorption of the seed or semen. _Semen._--Secretion of the testes. _Septic._--A substance that promotes putrefaction. Putrid. _Septum._--Partition. _Septicemia._--Poisoning by putrid substances. _Serous membrane._--The lining of cavities which have no external opening. _Seton._--An opening in the flesh made and continued by drawing through a skein of silk or linen thread or horsehair.