- shark - any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
--1 is a kind of elasmobranch, selachian
--1 has particulars:Derived form: verb shark2 - shark - a person who is ruthless and greedy and dishonest
--2 is a kind of wrongdoer, offender
--2 has particulars: usurer, loan shark, moneylender, shylock- shark - a person who is unusually skilled in certain ways; "a card shark"
--3 is a kind of expert
- shark - a person who is unusually skilled in certain ways; "a card shark"