<span class="searchmatch">portōriī</span> genitive singular of portōrium...
<span class="searchmatch">portōriīs</span> dative/ablative plural of portōrium...
having an equivalent etymology. Compare portitōrium. portōrium n (genitive <span class="searchmatch">portōriī</span> or portōrī); second declension (in Roman Republic) port duty, levie paid...