χερμ-άδιον · cherm-adion — LSJ
large stone, boulder
large stone, boulder, such as were used for missiles by the heroes of the Il., ὀκριόεν 4.518; μεγάλα 11.265, cf. 14.410; ὁ δὲ χερμάδιον λάβε χειρὶ . . , μέγα ἔργον, ὃ οὐ δύο γʼ ἄνδρε φέροιεν 5.302, 20.285; twice in Od., ἀνδραχθέσι χερμαδίοισι βάλλον, of the Laestrygones, 10.121, cf. 21.371.
II of the shape, size of a χερμάς, for arm-exercises
= χερμάς I, Aen. Tact. 38.6.—Not a Dim. of χερμάς, but neut. of an Adj. χερμάδιος, ον, of the shape or size of a χερμάς, μολύβδαιναι χερμάδιοι leaden balls for arm-exercises, Luc. Lex. 5.