n. In fortification, a strong grating of timber or iron, somewhat resembling a harrow, made to slide in vertical grooves in the jambs of the entrance-gate of a fortified place, to protect the gate in case of assault.n. In heraldry: Same as latticen. The representation of a portcullis: a rare bearing, but familiar in English art of the fifteenth century from its adoption as a badge by the Tudors and in the city arms of Westminster.n. One of the pursuivants of the English College of Heralds: so called from his distinctive badge.n. A coin struck in the reign of Queen Elizabeth, with a portcullis stamped on the reverse.To arm or furnish with a portcullis; hence, to bar; obstruct.