Adductor mandibulae: the muscle that draws in or closes the mandible.
Adeloceratous: with concealed antennae: see cryptocerata.
Adephagous: belonging to the Adephaga: pentamerous, predatory, terrestrial beetles with filiform antennae and predatory habits: see hydradephagous.
Adherent: attached or clinging to.
Adipose: fat or fatty: see fat-body.
Adiscota: insects that develop into adults without forming imaginal discs; see discota.
Adminicula: supports or props: the spinous processes on the abdomen of boring and burrowing pupae.
Adnate: adjoining; adhering or growing together: closely connected.
Adpressed: laid or pressed to; contiguous.
Adsperse -us: with markings of closely crowded small spots.