Tuna

n. any of several kinds of large edible fish of the family Scombridae which are native to mild and tropical waters; meat of the tuna; various kinds of prickly pears

Tuna are several species of ocean-dwelling fish in the family Scombridae, mostly in the genus Thunnus. Some tuna are able to inhabit freshwater environs as well. Tunas are fast swimmers—they have been clocked at 77 km/h (48 mph)—and include several species that are warm-blooded. Unlike most fish species, which have white flesh, the flesh of tuna is pink to dark red. This is because tuna muscle tissue contains greater quantities of myoglobin, an oxygen-binding molecule. Some of the larger tuna species such as the bluefin tuna can raise their blood temperature above the water temperature with muscular activity. This enables them to live in cooler waters and survive a wider range of circumstances. Some tuna species and fisheries are overfished and there are risks of some tuna fisheries collapsing.
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In J. R. R. Tolkien's legendarium, Tirion upon Túna was the city of the Noldor in Valinor. It was here that Finwë ruled from, and where his sons Fëanor, Fingolfin and Finarfin lived.
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Transurethral needle ablation (TUNA) is a globally approved technique which can be done with a local anesthetic on an outpatient basis, and uses low energy radio frequency energy delivered through two needles to ablate (destroy) excess prostate tissue. A catheter that deploys the needles toward the obstructing prostate tissue is inserted into the urethra directly through the penis under local anaesthitic before the procedure begins. Some clinical studies have reported that TUNA improves the urine flow with minimal side effects when compared with other procedures.
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Noun
1. tropical American flat-jointed prickly pear; Jamaica
(synonym) Opuntia tuna
(hypernym) prickly pear, prickly pear cactus
2. important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks
(synonym) tuna fish, tunny
(hypernym) saltwater fish
(hyponym) albacore
(part-holonym) tunny
3. any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters
(synonym) tunny
(hypernym) scombroid, scombroid fish
(hyponym) albacore, long-fin tunny, Thunnus alalunga
(member-holonym) Thunnus, genus Thunnus
(part-meronym) tuna fish, tunny
4. New Zealand eel
(synonym) Anguilla sucklandii
(hypernym) eel

n. prickly pear, prickly pear-shaped fruit of a kind of cactus; student music group

adj. villain, rotten person

n. villain, rotten person

v. vagabondize