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kersey a heavy, smooth twilled cloth of wool or wool and cotton, used esp. for coats and uniforms. [2 definitions]
kestrel a small grayish red European falcon that hovers in the air with its head to the wind. [2 definitions]
ketch a sailing vessel with two masts, the larger one forward and the smaller one aft just ahead of the rudder.
ketchup a thick sauce for meat or potatoes, usu. made with tomato purée and spices.
ketoacidosis low blood pH due to high levels of ketone bodies in the blood, esp. occurring in cases of diabetes, alcoholism, and starvation.
ketone a highly reactive organic chemical compound containing a carbonyl group linked to two hydrocarbon radicals.
ketosis the excessive accumulation of ketones in the body.
kettle a broad, deep container in which to boil liquids, esp. water or soup; pot. [3 definitions]
kettledrum a large, deep, resonant drum, hemispherical in shape and usu. played with soft mallets.
kettle of fish (informal) an awkward, difficult, or embarrassing situation.
keV a unit of energy equal to one thousand electron-volts; kiloelectron volt.
Kewpie trademark for a small doll with plump rosy cheeks and large eyes.
key1 a notched or grooved object, usu. metal, that can open or close locks. [8 definitions]
key2 a low island near shore, as off the southern coast of Florida.
keyboard a row or rows of keys used to operate a piano, typewriter, computer, or the like. [4 definitions]
key chain a chain on which keys are strung, or a key ring attached by a short chain or clip to an ornament.
key club a private nightclub to which each member has a key.
keyed equipped with or having keys, as musical instruments. [3 definitions]
keyhole a hole in a lock for inserting a key to lock and unlock it.
Key lime pie a pie with a filling made of condensed milk and lime juice.
keynote in music, the note defining the basic tonality of a piece or section of a piece; tonic. [3 definitions]