| kat | (noun) the leaves of the shrub Catha edulis which are chewed like tobacco or used to make tea; has the effect of a euphoric stimulant | Synonyms: African tea, Arabian tea, cat, khat, qat, quat |
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| katabolism | (noun) breakdown in living organisms of more complex substances into simpler ones together with release of energy | Synonyms: catabolism, destructive metabolism, dissimilation |
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| katamorphism | (noun) metamorphism that occurs at or near the earth's surface; breaks down complex minerals into simpler ones | - |
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| katharobe | (noun) an organism that lives in an oxygenated medium lacking organic matter | - |
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| katharometer | (noun) measures thermal conductivity | - |
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| katharsis | (noun) (psychoanalysis) purging of emotional tensions | Synonyms: abreaction, catharsis |
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| (noun) purging the body by the use of a cathartic to stimulate evacuation of the bowels | Synonyms: catharsis, purgation |
| katydid | (noun) large green long-horned grasshopper of North America; males produce shrill sounds by rubbing together special organs on the forewings | - |
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| katzenjammer | (noun) loud confused noise from many sources | Synonyms: brouhaha, hubbub, uproar |
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| (noun) disagreeable aftereffects from the use of drugs (especially alcohol) | Synonyms: hangover |