Fecundation: the making fertile; as an egg by a spermatozoön.
Feeler: commonly applied to antennae; q.v.
Feelers: tactile organs: the term is usually applied to the antennae, but sometimes to the palpi, as mouth-feelers.
Feet: the legs or organs of locomotion; one pair attached to each thoracic segment; composed of coxa, trochanter, femur, tibia and tarsus only; plural of foot; q.v.
Female: designated by "O+" the astronomical sign for Venus: that sex in which the ova are developed. { Scanner's comment: The sign for Venus being an orthogonal cross or plus sign hanging vertically below a circle.}
Femina: the female, or belonging to that sex.
Femorate -us: with abnormal or unusually developed femora or thighs.
Femoro-tibial: pertaining to both femur and tibia or to the articulation between them.
Femur -ora: the thigh: usually the stoutest segment of the leg, articulated to the body through trochanter and coxa and bearing the tibia at its distal end: in Coccidae and quite commonly, the femur and trochanter are considered as one, for measuring purposes.
Fenestra: a window; a transparent glassy spot or mark; a pellucid mark in a vein: a small, pale, membranous area at the base of the antenna in roaches.
Fenestrate: with transparent or window-like naked spots as in the wings of some Lepidoptera.
Fenestrate membrane: of the compound eye is at the base of the ommatidia, at their junction with the optic nerve; see retina.
Ferreous -eus: the metallic gray of polished iron.
Ferrugineous -ous, -eus, -osus: rusty red-brown [Dragon's blood, but brighter].
Ferrugino-testaeeous: a rusty yellow brown: a mixture of rusty red with dull yellow brown.
Fertilization: takes place when a spermatozoön enters through the micropyle of an ovum and unites with the cell nucleus: loosely applied like copulation or to its completion.
Festooned: arranged in loops as if hung from nails.
Fibre: a thread-like structure of any tissue.
Fibrilla: rod or sliver-like nerve elements, often grouped like a bundle of short threads.
Fibrin: a proteid compound making up a large part of the muscular tissue: also found in blood and other body liquids.
Fibrinogen: a proteid substance of the blood and other body fluids, concerned in the production of fibrin.