| bluefin | (noun) largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics | Synonyms: bluefin tuna, horse mackerel, Thunnus thynnus |
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| (noun) flesh of very large tuna | Synonyms: bluefin tuna |
| cycloolefin | (noun) alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character. | Synonyms: cycloalkene |
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| lobefin | (noun) any fish of the order Crossopterygii; most known only in fossil form | Synonyms: crossopterygian, lobe-finned fish |
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| olefin | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: alkene, olefine |
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