Lewis Short
assŭla | astŭla (noun F) : (in many MSS. ), , dim. axis.
* A splinter, shaving, chip: at etiam cesso foribus facere hisce assulas,Plaut. Merc. 1, 2, 20: Melandrya vocantur quercūs assulis similia,Plin. 9, 15, 18, § 48: assula tenuis brevisque,id. 16, 11, 22, § 54. —Of marble, a chip, shiver, Vitr. 7, 6.—*
* A shingle, σχίδη: Bibacul. ap. Suet. Gram. 11.
Charlton T. Lewis, Charles Short, A Latin Dictionary