FENES´TRATE, _a._ Furnished with openings (from _fenestra_, a window).
FE´RAL, _a._ Wild; not tamed. Opposed to _domestic_. The mallard is the
_feral_ stock of the tame duck.
FERRUGIN´EOUS or FERRU´GINOUS, _a._ Rusty-red.
FE´TUS or FŒ´TUS, _n._ Unborn young. (But the unhatched young of birds
are oftener called _embryos_.)
FIBRIL´LA, _n._; pl. _fibrillæ_. Little fibre.
FIB´RIN, _a._ Certain animal substance of fibrous composition, found in
the blood and elsewhere.
FI´BRO-CAR´TILAGE, _n._ A kind of cartilage of fibrous structure, such
as that between vertebræ and many other joints.
FIB´ULA, _n._ Smaller outer leg-bone, lying alongside the tibia.
FIL´AMENT, _n._ Thread or slender fibre.
FILAMENT´OUS, FIL´IFORM, _a._ Threadlike; composed of filaments;
oftener, very narrowly linear.
FILOPLUMA´CEOUS, _a._ Having the structure of a filoplume.
FIL´OPLUME, _n._ Thread-like or hair-like feather; one with slender
scape, and without web in most or all of its length.
FIM´BRIATED, _a._ Fringed.
FISSIPAL´MATE, _a._ Lobiped and semipalmate, as a grebe’s foot is.
FIS´SIPED, _a._ Having cleft toes. Opposed to _palmiped_.
FISSIROS´TRAL, _a._ Having the bill cleft far beyond the base of its
horny part.
FISSIROS´TRES, _n._ An obsolete order of cleft-billed birds.
FLAM´MULATED, _a._ Pervaded with reddish color.