baleen

noun

  1. A horny keratinous substance found in two rows of transverse plates which hang down from the upper jaws of baleen whales

noun

  1. Any of a suborder (Mysticeti) of usually large whales typically of colder waters that lack teeth but have baleen plates in the upper jaw which are used to filter chiefly small crustaceans (such as krill) out of large quantities of seawater see fin whale, gray whale, humpback whale, right whale, rorqual compare toothed whale

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