| acronym | (noun) a word formed from the initial letters of the several words in the name and pronounced as one word | Synonyms: initialism |
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| chylomicron | (noun) a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood | - |
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| crone | (noun) an ugly evil-looking old woman | Synonyms: beldam, beldame, hag, witch |
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| crony | (noun) a close friend who accompanies his buddies in their activities | Synonyms: brother, buddy, chum, pal, sidekick |
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| cronyism | (noun) favoritism shown to friends and associates (as by appointing them to positions without regard for their qualifications) | - |
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| macron | (noun) a diacritical mark (-) placed above a vowel to indicate a long sound | - |
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| micromicron | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: picometer, picometre |
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| micron | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micrometre |
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| micronutrient | (noun) a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) | - |
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| millimicron | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, nanometer, nanometre, nm |
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| omicron | (noun) the 15th letter of the Greek alphabet | - |
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