Baleen is whalebone

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Related to baleen: Baleen plates, Baleen whales

baleen

or

whalebone

horny plates which hang from the roof of the mouth in some whales (Mysticeti), e.g. right whales and rorquals. The plates filter out krill (small shrimplike  crustaceans) from the sea water as it is forced out of the mouth.

From
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005