from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having a decreased tendency to provoke an allergic reaction: hypoallergenic cosmetics.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Containing fewer allergens.
Coined between 1950 and 1955 from hypo- + allergenic. Some say that it was coined by advertisers in 1953. Merriam-Webster puts the date at 1940. (Wiktionary)