fluorescence. Power of a body to change wave-rate (or color) of light passing through it.
focus. Point at which light rays meet. The starting point of a disease process.
follicle. A small secretory cavity or sac.
form. Shape, as in vermiform, resembling a worm in shape.
formaldehyde. A gas possessing powerful disinfectant properties.
fracture. A break, as of a bone.
fulcrum. The point against which lever is placed to get purchase.
fungating. Rapidly growing (path.).
fungus (plural fungi). A cellular vegetable organism which feeds on organic matter. Example, bacteria.
furunculosis. The systemic condition marked by boil-formation.