Axillary excision: = a. incision, q.v.
Axillary incision: Diptera; an incision on inner margin of wing, near base, which separates the alula from the main part.
Axillary lobe: the sclerite covering the base of the wing in Diptera; see also alula and posterior lobe.
Axillary vein: one or two longitudinal veins toward the inner margin from the anal vein (Ephemeridae); a group of several (10-20) radiate veins that occupy the anal field in Orthoptera.
Axis: a small process at base of elytron, upon which it turns.
Azure -eus: clear sky-blue [cobalt blue].
Azygos: unpaired; a structure without a fellow; sometimes applied to an unpaired oviduct specifically the enlarged portion of the vagina at the junction of the oviducts and thus = uterus.
Baccate -us: berry-like: applied to bladder-like ovaries from the surface of which the short ovarian tubes arise.
Back: the dorsum or upper surface.