ight.

OPAQUE. See OPACITY.

OPHTHALMIA. Inflammation of the eye.

OPHTHALMIC. Belonging to the eye.

OPHTHALMOSCOPE. An instrument for examining the inside of the eye, for
diagnostic purposes.

OPTIC NERVE. The nerve connecting the brain and eye, and employed in the
sense of sight.

ORGANIC. Pertaining to the structure of an organ.

ORIFICE. Opening or mouth.

OSSEOUS TISSUE. Bony structure.

OSSIFICATION, OSSIFYING. Made into bone by the deposit of phosphate of
lime.

OS UTERI. Mouth of womb. Illus. page 206.

OVA. Plural of ovum.

OVARIES. Two ovoid bodies situated either side of the womb. Illus. page
206.

OVARY. The female organ in which the ovum, or germ-cell, is formed.
Illus, page 206.

OVULATION. The formation of the germ-cell in the ovary and its release
from that organ.

OVUM. Defined and illustrated on pages 12 and 13.

OXYGEN. The vital gas of the atmospheric air.

OZAENA. Described on page 474.

P

PALLIATIVE. A remedy or treatment which relieves, but does not cure.

PAPILLA, PAPILLAE. Small, nipple-shaped prominences found on the tongue,
the skin, etc.

PARAPLEGIA. Paralysis affecting the upper or lower extremities of the
body

PARASITES. Animals which live in the bodies of other animals; as the
tape-worm itch insect, etc.

PARENCHYMA. The texture of an organ; as the liver, kidneys, etc.

PAROTID GLANDS. These are situated under the ear, just at the angle of
the lower jaw, and secrete saliva.

PAROXYSMS. The periodical attack, fit or aggravation in the course of a
disease.

PARTURIENT. Bringing forth or having recently brought forth.

PARTURITION. Labor; the delivery of the foetus.

PASTILES. Small medicated lozenges.

PATHOGNOMONIC. A _characteristic_ symptom of a disease.

PATHOLOGY. That part of the Science of Medicine the object of which is
the knowledge of disease.

PEDICLE. The stalk or narrow part of a tumor by which it is attached and
supported.

PELVIC. Belonging to and relating to the pelvis.

PELVIS. The lower part of the abdomen or trunk, composed of bone,
containing the genital and urinary organs; supports the backbone and is
supported by the legs.

PENIS. The male organ of generation. Illus. page 207.

PEPSIN. The digestive solvent secreted by the stomach.

PEPTIC. Pertaining to the stomach.

PERCUSSION. Striking the surface and by the sound produced judging of
the condition of the internal organs.

PERICARDITIS. Described on page 54