| 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 |
| boffin | (noun) (British slang) a scientist or technician engaged in military research | - |
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| bowfin | (noun) primitive long-bodied carnivorous freshwater fish with a very long dorsal fin; found in sluggish waters of North America | Synonyms: Amia calva, dogfish, grindle |
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| coffin | (noun) box in which a corpse is buried or cremated | Synonyms: casket |
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| cycloolefin | (noun) alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character. | Synonyms: cycloalkene |
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| fin | (noun) organ of locomotion and balance in fishes and some other aquatic animals | - |
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| (noun) a stabilizer on a ship that resembles the fin of a fish | - |
| (noun) one of a set of parallel slats in a door or window to admit air and reject rain | Synonyms: louver, louvre |
| (noun) a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater) | Synonyms: flipper |
| (noun) one of a pair of decorations projecting above the rear fenders of an automobile | Synonyms: tail fin, tailfin |
| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintet, quintuplet, V |
| griffin | (noun) winged monster with the head of an eagle and the body of a lion | Synonyms: griffon, gryphon |
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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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| muffin | (noun) a sweet quick bread baked in a cup-shaped pan | Synonyms: gem |
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| olefin | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: alkene, olefine |
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| paraffin | (noun) from crude petroleum; used for candles and for preservative or waterproof coatings | Synonyms: paraffin wax |
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| (noun) (British usage) kerosine | Synonyms: paraffin oil |
| (noun) a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2) | Synonyms: alkane, alkane series, methane series, paraffin series |
| puffin | (noun) any of two genera of northern seabirds having short necks and brightly colored compressed bills | - |
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| ragamuffin | (noun) a dirty shabbily clothed urchin | Synonyms: tatterdemalion |
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| soupfin | (noun) Pacific shark valued for its fins (used by Chinese in soup) and liver (rich in vitamin A) | Synonyms: Galeorhinus zyopterus, soup-fin, soupfin shark |
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| tailfin | (noun) a stabilizer that is part of the vertical tail structure of an airplane | Synonyms: tail fin, vertical fin, vertical stabiliser, vertical stabilizer |
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| (noun) one of a pair of decorations projecting above the rear fenders of an automobile | Synonyms: fin, tail fin |
| threadfin | (noun) mullet-like tropical marine fishes having pectoral fins with long threadlike rays | - |
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| tiffin | (noun) a midday meal | Synonyms: dejeuner, lunch, luncheon |
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| yellowfin | (noun) may reach 400 pounds; worldwide in tropics | Synonyms: Thunnus albacares, yellowfin tuna |
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