krill

[kril]
noun, plural krill.
any of the small, pelagic, shrimplike crustaceans of the family Euphausiidae, eaten as food by certain whales.

Origin:
1905–10; < Norwegian kril young fry (of fish)

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World English Dictionary
krill (krɪl)
 
n , pl krill
any small shrimplike marine crustacean of the order Euphausiacea: the principal food of whalebone whales
 
[C20: from Norwegian kril young fish]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

krill
1907, from Norw. kril "small fry of fish."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
krill   (krĭl)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
And overfishing of krill, a tiny crustacean that other marine life feed on,
  threatens the whole eco-system of the region.
More algae might mean more krill, and that might mean more whales and other
  large sea animals.
And higher on the food chain it is zooplankton, such as krill, that are feasted
  on by marine life ranging from fish to whales.
Here they fatten up on krill before heading north for the winter.
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