tuna
11. any of various large marine spiny-finned fishes of the genus Thunnus, esp T. thynnus, chiefly of warm waters: family Scombridae. They have a spindle-shaped body and widely forked tail, and are important food fishes
2. any of various similar and related fishes
tuna
21. any of various tropical American prickly pear cacti, esp Opuntia tuna, that are cultivated for their sweet edible fruits
2. the fruit of any of these cacti
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005