GLOSSAEY OF SCIENTIFIC TERMS. 1261 



Oedema — Effusion of serous fluid into the cellular tissues, producing 



svvelliug. 

 Oil — Fluid fatty or unctuous substances, either animal or vegetable. 



Oils are either fixed or volatile ; the former leave a greasy stain on 



paper. 

 Omentum. — The caul. A fold of the peritoneal membrane, covering the 



intestines in front, and attached to the stomach. 

 Omnivorous — Animals which cat all kinds of food. Swine are omniv- 

 orous, in the general acceptation of the term. 

 Opacity — Want of transparency ; that quality of bodies by virtue of 



which they cannot transmit rays of light. 

 Optic — Relating to the sight, as the optic nerve ; relating to the laws of 



vision. 

 Or'bit — In ocular anatomy, the bony cavity in whicli the eye is situated. 

 Organ — The natural instrument by which a process or function is 



carried on. 

 Organic — Composed of, or pertaining to, an organ or its functions; de. 



pendent on, or resulting from, organism. 

 Orifice — The mouth or entrance to any cavity of the body. 

 Origin — The beginning or starting point of a thing. 

 Os — The technical name for bone. 

 Os calcis — The tip of the back. 

 Osseous — Bony, or resembling bone, 

 Os cheocele — Scrotal hernia. Any tumor of the hernia. 

 Ossification — Changing to bone. Bony formation. 

 Ostalgia — Pain in one or some of the bones. 

 Osteo sarcoma — A fleshy, cartilaginous mass, growing within a bone, 



enlarging and sometimes fracturing it. 

 Ovariotomy — The art or operation of removing the ovaries from the 



female animal ; spaying — analogous to the gelding of the male. 

 Ovaries — The organs connected with the uterus that mature and give off 



the ova (eggs) which, when impregnated, produce the foetus. 

 Ovule — The impregnated germ or egg. 

 Oxidize — The change formed by the action of oxygen, or air containing 



oxygen, on any substance. The changing of the black or venous blood 



into red or arterial blood, in the lungs. 

 Ozcena — Gleet, catarrh. 

 Pabulum — That which is proper for food. 

 Palate — The roof of the mouth. 

 Palpitation — A rapid, thumping movement of the heart, from mental 



excitement or from disease. 



