-atic

Etymology tree Proto-Indo-European *-tis Ancient Greek -τις (-tis) Ancient Greek -σῐς (-sĭs) Proto-Indo-European *-kos Ancient Greek -κός (-kós) ? Proto-Indo-European *-tós Ancient Greek -τος (-tos) ▲ Ancient Greek -κός (-kós) ? Ancient Greek -τῐκός (-tĭkós)bor. English -tic English -atic Rebracketing of -tic after Greek words ending in -μα (-ma), such as problematic; extended to new environments in modern scientific coinages as such lymphatic; likely reanalyzed as if from -ate + -ic.

来源：wiktionary