Vertical triangle: in male Diptera, the small triangle upon which the ocelli are situated; limited behind by vertex, in front by eyes.
Verticil: one of the whorls of long fine sensitive hair arranged symmetrically on the joints of the antennae in certain Diptera.
Verticillate: placed in whorls: antennae in which the joints have a circle of long, fine hair as in Cecidomyiids.
Vesicant: blistering: able to produce a blister.
Vesicle of penis: in Odonata, a sac with chitinous walls, attached to the sternum behind the penis.
Vesicles: little sacs, bladders or cysts: applied to extensible organs producing odors or secretions, as in some beetles and caterpillars.
Vesicular: bladder-like; beset with spherical prominences.
Vesicula seminalis: see seminal vesicles.
Vestibule: the space around the ovipositor formed by the projecting margins of the surrounding segments: the space between the occluding structure of the spiracle and the valve opening into the trachea itself.
Vestigial: small or degenerate: only a trace or remnant of a previously functional organ.