Lewis & Short

ăpostŏlĭcus, a, um, adj., = ἀποστολικος, relating to an apostle, apostolic (eccl. Lat.): aetas, Tert. Praescr. adv. Haer. 32: doctrina, id. ib.
Hence, Ăpostŏlĭci, ōrum, m., the pupils and friends of the Apostles, Tert. Praescr. adv. Haer 32; the name of a Christian sect, Isid. 8, 5, p. 257 Lind. al