| koala | (noun) sluggish tailless Australian arboreal marsupial with grey furry ears and coat; feeds on eucalyptus leaves and bark | Synonyms: kangaroo bear, koala bear, native bear, Phascolarctos cinereus |
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| koan | (noun) a paradoxical anecdote or a riddle that has no solution; used in Zen Buddhism to show the inadequacy of logical reasoning | - |
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| kob | (noun) an orange-brown antelope of southeast Africa | Synonyms: Kobus kob |
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| kobo | (noun) 100 kobos equal 1 naira in Nigeria | - |
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| kohl | (noun) a cosmetic preparation used by women in Egypt and Arabia to darken the edges of their eyelids | - |
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| kohleria | (noun) shrubby herb cultivated for their soft velvety foliage and showy scarlet flowers | - |
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| kohlrabi | (noun) fleshy turnip-shaped edible stem of the kohlrabi plant | Synonyms: turnip cabbage |
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| (noun) plant cultivated for its enlarged fleshy turnip-shaped edible stem | Synonyms: Brassica oleracea gongylodes |
| koine | (noun) a common language used by speakers of different languages | Synonyms: interlanguage, lingua franca |
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| koinonia | (noun) Christian fellowship or communion with God or with fellow Christians; said in particular of the early Christian community | - |
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| kola | (noun) tree bearing large brown nuts containing e.g. caffeine; source of cola extract | Synonyms: Cola acuminata, goora nut, kola nut, kola nut tree |
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| kolkhoz | (noun) a collective farm owned by the communist state | - |
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| kolkhoznik | (noun) a member of a kolkhoz | - |
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| komondor | (noun) Hungarian breed of large powerful shaggy-coated white dog; used also as guard dog | - |
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| konimeter | (noun) A konimeter is a device for measuring airborne dust concentration in which samples are obtained by sucking the air through a hole and allowing it to pass over a glass plate coated with grease on which the particles collect. | - |
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| konini | (noun) erect deciduous shrub or tree to 10 feet with maroon flowers; New Zealand | Synonyms: Fuchsia excorticata, native fuchsia, tree fuchsia |
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| koodoo | (noun) either of two spiral-horned antelopes of the African bush | Synonyms: koudou, kudu |
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| kook | (noun) someone regarded as eccentric or crazy and standing out from a group | Synonyms: odd fellow, odd fish, odd man out, queer bird, queer duck |
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| kookaburra | (noun) Australian kingfisher having a loud cackling cry | Synonyms: Dacelo gigas, laughing jackass |
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| kopeck | (noun) 100 kopecks equal 1 ruble in Russia | Synonyms: copeck, kopek |
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| kopek | (noun) 100 kopecks equal 1 ruble in Russia | Synonyms: copeck, kopeck |
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| kopiyka | (noun) 100 kopiykas equal 1 hryvnia in Ukraine | - |
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| kopje | (noun) a small hill rising up from the African veld | Synonyms: koppie |
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| koppie | (noun) a small hill rising up from the African veld | Synonyms: kopje |
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| kor | (noun) an ancient Hebrew unit of capacity equal to 10 baths or 10 ephahs | Synonyms: homer |
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| korlan | (noun) the fruit from the korlan tree. | - |
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| koruna | (noun) the basic unit of money in Czech Republic | - |
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| (noun) the basic unit of money in Slovakia | - |
| kos | (noun) (in India) a unit of length having different values in different localities | Synonyms: coss |
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| kosher | (noun) food that fulfills the requirements of Jewish dietary law | - |
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| kosherness | (noun) The property of being fit to eat under Jewish dietary laws. | - |
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| koto | (noun) Japanese stringed instrument that resembles a zither; has a rectangular wooden sounding board and usually 13 silk strings that are plucked with the fingers | - |
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| kotow | (noun) a former Chinese custom of touching the ground with the forehead as a sign of respect or submission | Synonyms: kowtow |
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| koudou | (noun) either of two spiral-horned antelopes of the African bush | Synonyms: koodoo, kudu |
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| koumiss | (noun) an alcoholic beverage made from fermented mare's milk; made originally by nomads of central Asia | Synonyms: kumis |
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| kowhai | (noun) shrub or small tree of New Zealand and Chile having pendulous racemes of tubular golden-yellow flowers; yields a hard strong wood | Synonyms: Sophora tetraptera |
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| kowtow | (noun) a former Chinese custom of touching the ground with the forehead as a sign of respect or submission | Synonyms: kotow |
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