| shark | | |
| n. (animal) | 1. shark | any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales. |
| ~ elasmobranch, selachian | any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates. |
| ~ cow shark, hexanchus griseus, six-gilled shark | large primitive shark widely distributed in warm seas. |
| ~ mackerel shark | fierce pelagic and oceanic sharks. |
| ~ alopius vulpinus, fox shark, thresher shark, thresher, thrasher | large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed. |
| ~ carpet shark, orectolobus barbatus | shark of the western Pacific with flattened body and mottled skin. |
| ~ ginglymostoma cirratum, nurse shark | small bottom-dwelling shark of warm shallow waters on both coasts of North America and South America and from southeast Asia to Australia. |
| ~ carcharias taurus, odontaspis taurus, sand shark, sand tiger | shallow-water shark with sharp jagged teeth found on both sides of Atlantic; sometimes dangerous to swimmers. |
| ~ rhincodon typus, whale shark | large spotted shark of warm surface waters worldwide; resembles a whale and feeds chiefly on plankton. |
| ~ cat shark | small bottom-dwelling sharks with cat-like eyes; found along continental slopes. |
| ~ requiem shark | any of numerous sharks from small relatively harmless bottom-dwellers to large dangerous oceanic and coastal species. |
| ~ dogfish | any of several small sharks. |
| ~ hammerhead shark, hammerhead | medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous. |
| ~ angel shark, squatina squatina, angelfish, monkfish | sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do. |
| n. (person) | 2. shark | a person who is ruthless and greedy and dishonest. |
| ~ offender, wrongdoer | a person who transgresses moral or civil law. |
| ~ loan shark, moneylender, shylock, usurer | someone who lends money at excessive rates of interest. |
| n. (person) | 3. shark | a person who is unusually skilled in certain ways.; "a card shark" |
| ~ expert | a person with special knowledge or ability who performs skillfully. |
| v. (social) | 4. shark | play the shark; act with trickery. |
| ~ chisel, cheat | engage in deceitful behavior; practice trickery or fraud.; "Who's chiseling on the side?" |
| v. (competition) | 5. shark | hunt shark. |
| ~ fish | catch or try to catch fish or shellfish.; "I like to go fishing on weekends" |
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