Lewis & Short

grăphĭum, ĭi, n., = γραφίον (pure Lat. scriptorium, Isid. 6, 9, 2), a writingstyle, Ov. Am. 1, 11, 23; Sen. Clem. 1, 14; Plin. 16, 38, 73, § 184; Suet. Caes. 82; id. Calig. 28; id. Claud. 15.