Lewis & Short

Mĕgărĭcus, a, um, adj., = Μεγαρικός, of or belonging to the city of Megara, Megaric: ager, Plin. 17, 7, 4, § 42: Megaricus sinus, a part of the Saronic Gulf, near Megara, id. 4, 12, 19, § 57: signa, i. e. of marble from Megara, Cic. Att. 1, 8, 2; 1, 9, 2.
Mĕgărĭci, ōrum, m., sc. philosophi, the followers of Euclid, Cic. Ac. 2, 42, 129.