cys·tic \ˈsistik, -tēk\adjective Etymology: French cystique, from New Latin cysticus, from cystis cyst + Latin -icus -ic — more at cyst 1. a.: of or relating to a cyst b.: of or relating to the urinary bladder or gallbladder 2.: being a cyst : made up of cysts < cystic tissue > 3.: containing a cyst or cysts < a cystic tumor > : involving the formation of cysts < cystic degeneration > 4.: enclosed in a cyst : encysted < a cystic worm larva >