Lewis & Short

ŏpuscŭlum, i, n. dim. [1. opus], a little work (class.): Myrmecides minutorum opusculorum fabricator, Cic. Ac. 2, 38, 120: accipies igitur hoc parvum opusculum lucubratum his jam contractioribus noctibus, id. Par. prooem. § 5: Cassi Parmensis, Hor. Ep. 1, 4, 3: mea, id. ib. 1, 19, 35.