ferment. An organic substance which in small quantities is capable of setting up changes in another organic substance without itself undergoing much change.
fermentation. Such changes as are effected exclusively by the vital action of ferments.
fibrin. Active agent in blood coagulation.
fibroma. A tumor of fibrous tissue.
fibrous. Composed of fibres.
fibula. External and smaller of the two bones of the leg.
fissure. A crack in the tissues.
fistula. A pathologic sinus leading from an abscess cavity to the surface.
flagella. The whiplike processes with which certain cells, as the ameba, are provided.
flexion. Bending.