Designation by the FDA that a chemical or substance (including certain pesticides) added to food is considered safe by experts, and so is exempted from the usual FFDCA food additive tolerance requirements.
GENERALLY RECOGNIZED AS SAFE (GRAS)
Meaning of GENERALLY RECOGNIZED AS SAFE (GRAS) in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012