s_, within). The part of the alimentary canal which
is continuous with the lower end of the stomach; also called the bowels.

Iris (Lat. _iris_, the rainbow). The thin, muscular ring which lies
between the cornea and crystalline lens, giving the eye its special color.

Jaundice (Fr. _jaunisse_, yellow). A disorder in which the skin and eyes
assume a yellowish tint.

Katabolism (Gr. kataballo, to throw down). The process by means of which
the more complex elements are rendered more simple and less complex. The
opposite of _anabolism_.

Labyrinth. The internal ear, so named from its many windings.

Lacrymal Apparatus (Lat. _lacryma_, a tear). The organs for forming and
carrying away the tears.

Lacteals (Lat. _lac, lactis_, milk). The absorbent vessels of the small
intestines.

Laryngoscope (Gr. larugxi, larynx, and skopeo, to behold). An instrument
consisting of a mirror held in the throat, and a reflector to throw light
on it, by which the interior of the larynx is brought into view.

Larynx. The cartilaginous tube situated at the top of the windpipe.

Lens. Literally, a lentil; a piece of transparent glass or other
substance so shaped as either to converge or disperse the rays of light.

Ligament (Lat. _ligo_, to bind). A strong, fibrous material binding bones
or other solid parts together.

Ligature (Lat. _ligo_, to bind). A thread of some material used in tying a
cut or injured artery.

Lobe. A round, projecting part of an organ, as of the liver, lungs, or
brain.

Lymph (Lat. _lympha_, pure water). The watery fluid conveyed by the
lymphatic vessels.

Lymphatic Vessels. A system of absorbent vessels.

Malleus. Literally, the mallet; one of the small bones of the middle ear.

Marrow. The soft, fatty substance contained in the cavities of bones.

Mastication (Lat. _mastico_, to chew). The act of cutting and grinding the
food to pieces by means of the teeth.

Meatus (Lat. _meo_, _meatum_, to pass). A _passage_ or canal.

Medulla Oblongata. The "oblong marrow"; that portion of the brain which
lies upon the basilar process of the occipital bone.

Meibomian. A term applied to the small glands between the conjunctiva and
tarsal cartilages, discovered by _Meibomius_.

Membrana Tympani. Literally, the membrane of the drum; a delicate
partition separating the outer from the middle ear; it is sometimes
popularly called "the drum of the ear."

Membrane. A thin layer of tissue serving to cover som