n. The elastic horny substance which grows in place of teeth in the upper jaw of whales of the family Balænidæ (hence called whalebone or bone whales), forming a series of thin parallel plates from a few inches to several feet long; baleen (which see).n. Something made of whalebone or baleen; a piece of whalebone prepared for some regular use: as, the whalebones of a corset.n. Specificallyn. In the middle ages, ivory from the narwhal, walrus, or other sea-creature, or supposed to be from such a source. See whale's bone, under whale, n.Made of or containing whalebone.