<span class="searchmatch">copticōrum</span> genitive masculine/neuter plural of copticus...
copticī copticae coptica genitive copticī copticae copticī <span class="searchmatch">copticōrum</span> copticārum <span class="searchmatch">copticōrum</span> dative copticō copticae copticō copticīs accusative copticum...