‖ postˈdorsolum, -ulumEntom. [mod.L. f. post- B. 2 + *dorsulum, dim. of dorsum back.] ‘The middle-piece between the mesophragm and the postscutellum’ (Kirby and Spence). 1826Kirby & Sp.Entomol. III. xxxv. 570 The first external piece of the metathorax is the postdorsolum.