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whalebone (def 1).
Historical Examples

Unlike the baleen whales, the toothed whales do have teeth after birth.
Whales, Dolphins, and Porpoises of the Western North Atlantic Stephen Leatherwood

In these several respects they resemble the plates of baleen in the mouth of a whale.
On the Origin of Species Charles Darwin

This is the interior free fibrous margin of the baleen, which descends in long triangular plates from the upper jaw.
Omphalos Philip Henry Gosse

He has enormous teeth or tushes in the lower jaw, but has no baleen.
Ranching, Sport and Travel Thomas Carson

The baleen and the right lower lip of Bryde’s whales are dark gray.
Whales, Dolphins, and Porpoises of the Western North Atlantic Stephen Leatherwood

(g) The baleen of whales also belongs to the epidermal exoskeleton.
The Vertebrate Skeleton Sidney H. Reynolds

These are known as the baleen plates and form the whalebone of commerce.
Birds and Nature Vol. 11 No. 1 [January 1902] Various

The Toothed Whales are not furnished with baleen, but with teeth only.
The Cambridge Natural History, Vol X., Mammalia Frank Evers Beddard

So, also, the baleen of the whale and the teeth of the land mammalia are different organs.
Vestiges of the Natural History of Creation Robert Chambers

This is precisely how the plates of baleen are disposed in the mouth of a Whale.
The Cambridge Natural History, Vol X., Mammalia Frank Evers Beddard

noun
whalebone
n.

early 14c., “whalebone,” from Old French balaine (12c.) “whale, whalebone,” from Latin ballaena, from Greek phallaina “whale” (apparently related to phallos “swollen penis,” probably because of a whale’s shape), from PIE root *bhel- (2) “to blow, inflate, swell” (see bole). Klein writes that the Greek to Latin transition was “through the medium of the Illyrian language, a fact which explains the transition of Gk. -ph- into Latin -b- (instead of -p-).”
baleen
(bə-lēn’)
A flexible horny substance hanging in fringed plates from the upper jaw of baleen whales. It is used to strain plankton from seawater when feeding. Also called whalebone.