Mesorchium (Gr. mesos, middle; orchis, testicle) a. fold of peritoneum containing the foetal testicle before its descent.

Metacarpal (Gr. metakarpion, wrist), pertaining to the two bones between the knee and the fetlock joint of the horse.

Metro-peritonitis (Gr. metro, womb), peritonitis secondary to inflammation of the womb.

Miasma (Gr. miaicin , to pollute), a term having reference to germs generated in marshy districts.

Microbe (Gr. mikros, and bios, life), a vegetable or other micro-organism, often a disease germ.

Micrococcus (Gr. mikros, small, and kokkos, berry), a micro-organism having minute rounded elements, isolated, united in twos or in large numbers, or disposed in chaplets.

Microstoma (Gr. mikros, small, and stoma, mouth), abnormal smallness of the mouth.

Micturition (Lat. micturitio, micturire, to pass water), the act of passing water.

Mitral (Lat. mitra, mitre), resembling a mitre, said of a valve in the heart having two flaps.

Modus operandi (Lat.), the manner of operating or proceeding.

Molar (Lat. mola, a millstone), grinding or chewing; in the horse, relating to the twenty-four large teeth.

Monorchid (Gr. monos, single, and orchis, testicle), an animal in whom only one testicle has descended into the scrotum.

Morphology (Gr. morphe, form, and logos, discourse), the branch of science pertaining to form and structure.

Motor (Lat. movere, to move), a term applied to a class of nerves which transmit the power of motion to certain muscles.

Mucus (Lat.), a sort of slimy or viscid fluid secreted by membranes that line the mouth, intestines, etc. - hence called mucous membranes - and serving as a lubricant.

Mutualism (Lat. mutuus, reciprocal), the living together of organisms for mutual advantage; symbiosis.

Myelitis (Gr. myclos, marrow, and His, inflammation), inflammation of the spinal cord.

Myocarditis (Gr. mys, muscle, and kardia, heart; itis, inflammation), inflammation of the muscular tissue of the heart.

Myopic (Gr. myein, to close, and ops, eye), nearsighted.

N

Nausea (Lat. nausea; Gr. nausia, sea-sickness), sickness of the stomach, with inclination to vomit.

Navicular (Lat. navicula, a little ship), relating to the navicular bone, a bone in the foot of the horse, and to the synovial membrane of the navicular joint.

Necrosis (Gr. nekrosis, from nekros, dead), death of a large portion of any tissue.

Nematode (Gr. nematodes, thread-like), resembling a thread; applied to certain parasitic worms.

Neoplasm (Gr. neos, new; plasma, form), a new growth or tumour.

Neurectomy (Gr. neuron, nerve, ek, out, tome, a cutting), the operation of excising or cutting out part of a nerve.

Neurilemma (Gr. neuron, nerve, and lemma, busk), the outer sheath of a nerve.

Neuro-keratine (Gr. neuron, nerve, and keras, horn), a substance found in connection with some nerves.

Neurosis (Gr. neuron, nerve), a nervous disease, as epilepsy; a functional disease of the nerves or nerve centres.

Neurotomy (Gr. neuron, nerve, and tome, a cutting), division of a nerve.

Nictitating membrane, a piece of cartilage in the inner canthus or angle of the eye, used to displace foreign matter from the surface of the cornea.

Nosology (Gr. nosos, disease; logos, discourse), scientific classification of disease.

Nucleus (Lat. nucleus, from mux, nut), a small body situated in the middle of a cell. VOL. III.

O

Obturator (Lat. obturare, to stop up), a part that stops up an opening; applied to the obturator foramen on the floor of the pelvis.

Occipital (Lat. occipitalis, occipital), pertaining to the occiput.

Occiput (Lat. ob, against; caput, the head), the back or hinder part of the head in man, and the corresponding part in animals.

OEdema (Gr. oidema, oidein, to swell), a swelling due to the effusion of serous fluid into areolar tissue.

Oidium (Gr. dim. of don, an egg), a genus of parasitic fungi forming white disease of the vine; Oidium albicans, found in thrush on the tongue.

Olecranon (Gr.olekranon - olene, elbow, and kranion, bead), the large process at the head of the ulna.

Olein (Lat. oleum, oil), a constituent of fat composed of oleic acid and glycerine.

Omentum (Lat.), a fold of the peritoneum connecting the abdominal viscera.

Ophthalmia (Gr. ophthalmos, eye), inflammation of the eye.

Ophthalmic (Gr. ophthalmos, eye), pertaining to the eye.

Orchitis (Gr. orchis, testis, and itis. inflammation), inflammation of the testicle.

Osteo-porosis (Gr. osteon, bone, and poros, a pore), a disease of the bone which causes it to expand and to swell.

Ostitis (Gr. osteon, bone; itis, inflammation), inflammation of bone.

Ovariotomy (Lat. ovarium, ovary; Gr. tome, a cutting), the surgical removal of an ovary.

Ovisac (Lat. ovum, egg, saccus, sack), the sac of an individual ovum ; a Graafian follicle.

Oxalis (Gr. oxalis, sorrel), a genus of plants, the wood-sorrel, containing oxalic acid.

Oxyuris (Gr. oxys, sharp; oura, tail), a genus of nematode parasitic worms found in the intestines.

Ozone (Gr. ozein, to smell), an active oxidizing agent possessing antiseptic properties.

P

Palatine (Lat. palatum, palate), belonging to the palate, as the palatine bone.

Palmitin (Lat. palma, palm-tree), a constituent of animal and vegetable fats.

Palpation (Lat. palpare, to feel), the manipulation of a part with the hand or fingers.

Papilla (Lat., a nipple), any soft conical eminence, such as the nipple.

Papule (Lat. papula, a pimple), a pimple or small circumscribed elevation of the skin.

Paracentesis (Gr. para, beside, and kentesis, puncture), tapping a cavity of the body, as in the case of dropsy.

Paralysis (Gr. para, beside; lysis, a loosing), loss of faculty in nerves, with consequent loss of action in muscles.