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|Noun||1.||copepod crustacean - minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish|
plankton - the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water
crustacean - any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton
water flea, cyclops - minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms
fish louse - a kind of copepod