What does baleen mean?
Baleen is the tough, flexible material — made of keratin, like fingernails — that forms long, comb-like plates hanging from the upper jaws of certain great whales, including humpbacks, blues, and right whales. Instead of teeth, these filter feeders use baleen to strain huge volumes of seawater, trapping krill and small fish while expelling the water. The word doubles as the name for the substance itself: for centuries this 'whalebone' was harvested commercially and valued for being strong yet elastic, finding its way into corset stays, skirt hoops, umbrella ribs, carriage springs, and fishing rods before plastics replaced it. Today baleen appears most often in scientific writing about whales, in natural-history documentaries, and in discussions of conservation, since all baleen-bearing species are protected by international whaling bans. Its etymology traces back through French to Latin balaena, meaning whale, linking the material inseparably to the animal it comes from.
nounBaleen is the series of long, fringed plates made of keratin that hang from the upper jaw of certain whales (mysticetes), used to filter small prey such as krill from seawater. The word also refers to this material itself, historically known as whalebone.
- The keratinous filtering plates hanging from the upper jaws of mysticete (baleen) whales, used to strain food from water.
- The material of these plates, formerly called whalebone and used commercially in items such as corset stays, umbrella ribs, and buggy whips.
"Humpback whales gulp enormous mouthfuls of water and strain out krill through their baleen plates."
"A blue whale can consume several tonnes of krill in a day, sieving them through its baleen."
"Nineteenth-century dressmakers prized flexible strips of baleen for shaping corsets and hoop skirts."
Baleen is normally an uncountable mass noun. When counting, speakers say 'a baleen plate' or 'baleen plates' rather than pluralizing baleen itself.
"Each side of a humpback's upper jaw carries roughly three hundred baleen plates."
Before plastics, women's corsets were literally stiffened with parts of whales — that's why they were called 'whalebone stays'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of baleen
Baleen entered English in the early modern period via French baleine, which derives from Latin balaena, meaning 'whale'; the Latin itself was borrowed from Greek phalaina, of the same meaning. The word originally referred to the whale's bone-like filtering plates, hence the traditional English synonym 'whalebone'. Romance-language cognates include Spanish ballena and Italian balena, though these now denote the whale rather than the plates.
How baleen is actually used
The term is chiefly associated with marine biology and natural history; in historical or antique contexts it often appears under its older name 'whalebone'. It is a mass noun in most uses, though 'plates' is common when counting individual pieces. The adjective 'baleen' is sometimes applied attributively to whales ('baleen whales').
Easily confused with baleen
Blubber is the thick layer of fat beneath a whale's skin, whereas baleen is the keratinous filtering material in the whale's mouth.