Flabellum: a fan: a leafed structure: the transparent lobe at the end of the glossa in bees: also used as = flagellum; q.v.
Flabs: the lobes at the tip of the dipterous mouth:= labella; q.v.
Flaccid: feeble: limber: lax.
Flagelliform: whip-like; applied to a process.
Flagellum: that part of the antenna beyond the pedicel: a whip or whip-like process: the tail-like process of a spermatozooen.
Flammate -eus: flaming or fiery red [vermilion intensified].
Flange: a projecting rim or edge.
Flank: the sides of the thorax: the pleura.
Flaring: widening out like the mouth of a trumpet.
Flavescent: somewhat yellow.
Flavid: yellowed: sulphur yellow.
Flavo-testaceous: light yellow-brown: almost luteous.
Flavous -us: sulphur yellow [gamboge].
Flavo-vixens: green verging upon yellow [apple green + chrome yellow].
Flex: to bend: to curve back.
Flexible: pliable; with elastic properties.
Flexile -is: capable of being bent at an angle without breaking: flexible.
Flexuous -ose: almost zig-zag, without acute angles but more acute at angles than undulating: differs from sinuate in being alternately bent and nearly straight.
Flexor: that which bends; applied to muscles.
Flocculus -i: a hairy or bristly appendage on the posterior coxa of some Hymenoptera.
Floccus: a tuft of wool or wool-like hair.
Flosculiferous: species that bear a flosculus.
Flosculus: a small, tubular lunulate anal organ with a central style, in certain Fulgorids.
Fluviatile: inhabiting the margins of running streams.
Fly-blows: eggs or young maggots of flesh flies: meat is fly-blown when such eggs or larvae have been deposited on it.
Flying-hairs: very long slender surface hairs set in punctures.
Foetid glands: glandular structures from which a foul smelling liquid may be ejected.
Foliaceous: leaf-like, or resembling a leaf.
Explanation of Terms Used in Entomology · The Wunder Library — complete classics, free to read, with narration.