Tonelada

The tonelada (Spanish and Portuguese for "a tunful") was a conventional Spanish and Portuguese unit of mass, volume, and capacity roughly equivalent to the English "ton" in its various senses. In English following Spain and Portugal's adoption of the metric system, the toneladas are most often used to specify the capacity of Spanish and Portuguese ships during the Age of Exploration with greater care than simply using the misleadingly vague calque "ton". However, as with the ton, the specific size of the units varied with time and location.