Mandelic a. : Pertaining to an acid first obtained from benzoic aldehyde (oil of better almonds), as a white crystalline substance; -- called also phenyl glycolic acid.

Example:
Is Mandelic acid good for getting rid of acne and acne scars?

Taxonomy
Mandelic Acid, skin care, Resource Center, skin types, skin, alpha hydroxy acid, complexions, clarity, skin care industry, acid treatments, Alpha hydroxy acids, tools, molecular compounds, plant extracts, resurface, almond extract, popularity, acne.

Defination from the web:
Mandelic acid resource for skin care and beauty. ... Mandelic acid, an almond extract, is gaining popularity as an alpha hydroxy acid suitable for all skin types and complexions, giving it a unique advantage. ...