Aliphatic monocarboxylic acids derived from or contained in esterified form in an animal or vegetable fat, oil or wax. Natural fatty acids commonly have a chain of 4 to 28 carbons (usually unbranched and even-numbered), which may be saturated or unsaturated., taimses või loomses rasvas või vahades sisalduvad alifaatsed, tavaliselt 4-28 süsinikuaatomist koosneva ahelaga monokarboksüülhapped