=Pro´te-in.= Any one of a group of nitrogenized, noncrystallizable compounds similar to each other, widely distributed in the animal and vegetable kingdoms, and forming the characteristic constituents of the tissues and fluids of the animal body. They are formed by plants, the animal organism receiving them as food and transforming and assimilating them. They all contain carbon, hydrogen, nitrogen, oxygen and sulphur. Some of the most important are albumin, casein, legumin, fibrin, myosin and glutin. =Psy´chic.= Pertaining to the mind. =Pu´bes.= That part of the lower central hypogastric region which, in the adult, is covered with hair. The pubic region. =Pu´bic.= Pertaining to the pubes, or os pubis. =Pu´ber-ty.= The age at which the reproductive organs become functionally operative. =Pu´bi-ot´´o-my.= (_He-bos´te-ot´´omy._) The operation of cutting through the pubic bone, lateral to the median line. =Pu-er´pe-ral.= Pertaining to childbirth. =Pu´er-pe´´ri-um.= The period or state of confinement. The puerperium is the time succeeding labor which is necessary for the restoration of the genitals to their condition previous to pregnancy, or as near it as possible. It varies from 6 weeks to several months. =Pu´ru-lent.= Consisting of or containing pus. =Py-æ´mia.= Blood-poison of microbic origin. =Py´e-li´´tis.= Inflammation of the pelvis or the kidney. =Py´or-rhœ´´a.= A discharge of pus, especially from infection around the roots of the teeth. =Py-ro´sis.= Heartburn. Acidity of the stomach. Eructations of acid. =Re´flex-es.= Reflected actions or movements. Impulses received and transmitted by the nervous system without conscious volition. Involuntary responses to irritation. Automatic movements. =Re-frig´e-rant.= Relieving fever and thirst. A cooling remedy. Acidulous drinks and evaporating lotions are refrigerant. =Re-gur´gi-ta´´tion.= 1. The casting up of undigested food. 2. A backward flowing of the blood through the left auriculo-ventricular opening, on account of imperfect closure of the mitral valve. =Re´lax-a´´tion.= 1. A lessening of tension. 2. A mitigation of pain. =Re´nal.= Pertaining to the kidney. =Res´ti-tu´´tion.= 1. An act or process of restoration. 2. The rotation of the presenting part of the fœtus outside of the vagina. =Re´tro-gres´´sive.= Going or moving backward. Passing from a better to a worse condition. =Re´tro-ver´´sion.= The tipping of an entire organ backward. =Rick´ets.= (_Ra-chi´tis._) A constitutional disease of childhood in which the bones become soft and flexible from retarded ossification, due to deficiency of the earthy salts. =Ro-ta´tion.= The process of turning around an axis. =Rough´en-ing.= Any rough, coarse food that gives bulk to the intestinal contents without much nutrition. =Ru´be-fa´´ci-ent.= An agent that reddens the skin.