[meg-uh-vahy-tuh-min; British also meg-uh-vit-uh-min]
megavitamins, doses of vitamins much larger than the recommended dietary allowances.
Origin of megavitamin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A dose of a vitamin greatly exceeding the amount required to maintain health.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.