Krill definitions

krĭl
The collection of small marine crustaceans of the order Euphausiacea that are the principal food of baleen whales.
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Any of an order (Euphausiacea) of small, pelagic, shrimplike malacostracan crustaceans, the main food of baleen whales.
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Small crustaceans that float in the ocean in huge numbers and are one of the most important parts of zooplankton. Krill are the main food of baleen whales.
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Any of several small marine crustacean species of plankton in the order Euphausiacea in the class Malacostraca.
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Origin of krill

From Dutch kriel (“puny/tiny”), applied to fish fry (in the sense of hatchlings); sometimes interpreted as "whale food".