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keyhole a hole in a lock into which a key is put to lock and unlock it.
keypad a small panel with keys or buttons. Keypads are used to send a signal to an electronic device. Computers, telephones, calculators, and remote controls all have keypads.
key ring a metal ring for holding keys.
keystone the central stone at the top of an arch. [2 definitions]
key up to bring to a state of strong feeling or excitement.
kg an abbreviation for kilogram, or kilograms.
khaki a dull yellowish brown color. [3 definitions]
kick to strike with the foot. [6 definitions]
kickoff a kick in football that puts the ball into action and signals the beginning or continuing of the game. [2 definitions]
kick up one's heels to have a merry time.
kid1 a young goat. [3 definitions]
kid2 (informal) to joke or tease. [2 definitions]
kidnap to take by force and hold against a person's will in order to get money or some other valuable thing.
kidney one of a pair of organs in the body which remove water and waste products from the blood. The waste products go from the kidneys to the bladder in the form of urine. The kidneys are found high in the abdomen near the spine. [2 definitions]
Kiev the capital city of Ukraine.
kill1 to cause to die. [6 definitions]
killdeer a bird that is a kind of plover, with two black bands on a white breast. Killdeers are native to inland waters and fields of North America and have a loud, shrill cry that sounds like their name.
killer whale a black and white, toothed whale. Killer whales kill and eat seals and large fish.
killing the act of putting to death. [2 definitions]
kill two birds with one stone to meet two goals with one action.
kiln an oven for burning, baking, and drying. A kiln is used to make pottery and bricks or to dry wood.