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knuckle any of the rounded joints of a finger, esp. the joint that connects the finger to the hand. [4 definitions]
knuckle ball in baseball, a slow pitch thrown with the knuckles or tips of two or three fingers pressed against the ball, causing it to waver and jump; knuckler.
knucklebone the rounded bone of a knuckle or joint.
knuckle down to start working in a concentrated manner; apply oneself seriously.
knucklehead (informal) a stupid, inept person; fool.
knuckle joint any joint between two bones that forms a knuckle. [2 definitions]
knuckle under to give in under pressure; yield.
knurl a knot or protuberance, as on a tree; gnarl. [3 definitions]
knurled having small ridges. [2 definitions]
knurly being full of knurls or knots; gnarled.
KO abbreviation of "knockout," in boxing, the act of defeating an opponent by knocking him down for a count of ten. (see technical knockout.)
koala a furry marsupial, native to Australia, that climbs trees and feeds on eucalyptus leaves and bark; koala bear.
koan in Zen Buddhism, a nonsense question or paradox used as an aid to meditation in order to encourage a greater awareness of reality.
kobo the smaller monetary unit of Nigeria. (Cf. naira.)
kobold in Germanic folklore, a spirit or elf that haunts households. [2 definitions]
Kodiak bear an extremely large brown bear of coastal Alaska and British Columbia.
Kohinoor a large Indian diamond that is included in the British crown jewels.
kohl a powdered substance used esp. by women in some Eastern countries as eye makeup.
kohlrabi a plant of the cabbage family that has a bulbous, edible stem.
Kohoutek a comet first observed in 1973 and visible into 1974.
koine (sometimes cap.) the colloquial form of Greek widely spoken during the Hellenistic period and the period of the Roman Empire (often prec. by the). [2 definitions]