ompounds by the action of a
ferment. It differs in kind according to the nature of the ferment.

Fiber (Lat. _fibra_, a filament). One of the tiny threads of which many
parts of the body are composed.

Fibrilla. A little fiber; one of the longitudinal threads into which a
striped muscular fiber can be divided.

Fibrin (Lat. _fibra_, a fiber). An albuminoid substance contained in the
flesh of animals, and also produced by the coagulation of blood.

Flexion (Lat. _flecto_, to bend). The act of bending a limb, etc.

Follicle (Lat. dim. of _follis_, a money bag). A little pouch or
depression.

Fomentation (Lat. _foveo_, to keep warm). The application of any warm,
medicinal substance to the body, by which the vessels are relaxed.

Foramen. A hole, or aperture.

Frontal Sinus. A blind or closed cavity in the bones of the skull just
over the eyebrows.

Fumigation (Lat. _fumigo_, to perfume a place). The use of certain fumes
to counteract contagious effluvia.

Function (Lat. _functio_, a doing). The special duty of any organ.

Ganglion (Gr. ganglin, a knot). A knot-like swelling in a nerve; a smaller
nerve center.

Gastric (Gr. gaster, stomach). Pertaining to the stomach.

Gelatine (Lat. _gelo_, to congeal). An animal substance which dissolves in
hot water and forms a jelly on cooling. Germ (Lat. _germen_, a sprout,
bud). Disease germ; a name applied to certain tiny bacterial organisms
which have been demonstrated to be the cause of disease.

Germicide (_Germ_, and Lat. _caedere_, to kill). Any agent which has a
destructive action upon living germs, especially _bacteria_.

Gland (Lat. _glans_, an acorn). An organ consisting of follicles and
ducts, with numerous blood-vessels interwoven.

Glottis (Gr. glotta, the tongue). The narrow opening between the vocal
cords.

Glucose. A kind of sugar found in fruits, also known as grape sugar.

Gluten. The glutinous albuminoid ingredient of cereals.

Glycogen. Literally, "producing glucose." Animal starch found in liver,
which may be changed into glucose.

Gram. Unit of metric system, 15.43 grains troy.

Groin. The lower part of the abdomen, just above each thigh.

Gustatory (Lat. _gusto_, _gustatum_, to taste). Belonging to the sense of
_taste_.

Gymnastics (Gr. gumnaxio, to exercise). The practice of athletic
exercises.

Haemoglobin (Gr. haima, blood, and Lat. _globus_, a globe or globule). A
complex substance which forms the principal coloring constit