| bazooka | (noun) a portable rocket launcher used by infantrymen as an antitank weapon | - |
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| fanaloka | (noun) civet of Madagascar | Synonyms: Fossa fossa |
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| hookah | (noun) an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water | Synonyms: calean, chicha, hubble-bubble, hubbly-bubbly, kalian, narghile, nargileh, sheesha, shisha, water pipe |
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| hypokalemia | (noun) abnormally low level of potassium in the circulating blood leading to weakness and heart abnormalities; associated with adrenal tumors or starvation or taking diuretics | - |
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| kookaburra | (noun) Australian kingfisher having a loud cackling cry | Synonyms: Dacelo gigas, laughing jackass |
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| oka | (noun) South American wood sorrel cultivated for its edible tubers | Synonyms: oca, Oxalis crenata, Oxalis tuberosa |
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| (noun) a Turkish unit of weight equal to about 2.75 pounds | - |
| (noun) a Turkish liquid unit equal to 1.3 pints | - |
| okapi | (noun) similar to the giraffe but smaller with much shorter neck and stripe on the legs | Synonyms: Okapia johnstoni |
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| okay | (noun) an endorsement | Synonyms: O.K., OK, okeh, okey |
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| palooka | (noun) a second-rate prize fighter | Synonyms: stumblebum |
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| prokaryote | (noun) a unicellular organism having cells lacking membrane-bound nuclei; bacteria are the prime example but also included are blue-green algae and actinomycetes and mycoplasma | Synonyms: procaryote |
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| tokamak | (noun) a doughnut-shaped chamber used in fusion research; a plasma is heated and confined in a magnetic bottle | - |
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| yokai | (noun) Any of various supernatural monsters, sometimes shapeshifters, in Japanese folklore | - |
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