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portcullis (n.)

also port-cullis, c. 1300, from Old French porte coleice "sliding gate" (c. 1200, Modern French porte à coulisse), from porte "gate" (from Latin porta, from PIE root *per- (2) "to lead, pass over") + coleice "sliding, flowing," fem. of coleis, from Latin colatus, past participle of colare "to filter, strain" (see colander).

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Definitions of portcullis from WordNet

portcullis (n.)
gate consisting of an iron or wooden grating that hangs in the entry to a castle or fortified town; can be lowered to prevent passage;
From wordnet.princeton.edu