0 used when you suddenly understand or find something:
1 abbreviation for alpha-hydroxy acid: a type of organic acid that is used in some products intended to remove dead skin cells and to make the skin look healthy, attractive, and young:
2 used to express pleasure at suddenly understanding or learning the truth about something:
If you've never used products containing AHAs before, do a patch test.
AHAs have been believed for several years to be a natural anti-wrinkle agent.
Vitamins have taken over from AHAs (alpha-hydroxy acids) as the anti-ageing skincare ingredient of choice.
Soften your feet with a soak and a slather of a cream containing an AHA exfoliant.
The lotion's formula has an AHA concentration of 10%.
