Definition of trans-fatty acid noun from the Oxford Advanced Learner's Dictionary

 

trans-fatty acid

 noun
noun
BrE
 
; NAmE
 
(also trans-fat
BrE
 
; NAmE
 
)
[countable, uncountable] Diet, Unhealthy eating habits
 
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a type of fat produced when oils are changed by a chemical process into solids, for example to make margarine. Trans-fatty acids are believed to encourage the harmful development of cholesterol. foods that are low in trans-fatty acids see also monounsaturated fat, polyunsaturated fat, saturated fat, unsaturated fat See related entries: Diet, Unhealthy eating habits
See the Oxford Advanced American Dictionary entry: trans-fatty acid