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mega·vi·ta·min | \ ˌme-gə-ˈvī-tə-mən 
, British usually -ˈvi- \
, British usually -ˈvi- \Definition of megavitamin
: relating to or consisting of very large doses of vitamins
megavitamin therapy
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Time Traveler for megavitamin
The first known use of megavitamin was in 1968
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