Triple-masted

[…] E'en now He gnaws with keen exasperated tooth The rock that holds him shorebound to his seat, Buffets the pier and basis of the cliff, Seizes the tilting triple-masted bark, Light as a feather in his pow'rful grasp, Kindles her sleeping thunder, and enjoys Her frequent flashes of nocturnal woe. […]

Source: wiktionary

Just off the coast, to the right, a fine triple-masted Dutch cog of the sixteenth century heads for the open sea, its fore and aft sails already unfurled. The sailors are visible in the rigging, about to unfurl the remaining sails.

Source: wiktionary

If they had looked a little harder, the couple would have seen a square-rig, triple-masted clipper go by that was built in the nineteenth century. Nobody sails these kinds ofvessels anymore.

Source: wiktionary