plural noun

mega·​vi·​ta·​mins ˌme-gə-ˈvī-tə-mənz How to pronounce megavitamins (audio)
 British usually  -ˈvi-
: a large quantity of vitamins

Word History

First Known Use

1974, in the meaning defined above

Time Traveler
The first known use of megavitamins was in 1974

Dictionary Entries Near megavitamins

Cite this Entry

“Megavitamins.” Dictionary, Merriam-Webster, Accessed 18 Apr. 2024.

Medical Definition


noun plural
mega·​vi·​ta·​mins -mənz How to pronounce megavitamins (audio)
: a large quantity of vitamins
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