What does Acid, trans fatty mean?

Acid, trans fatty meaning in Medical Dictionary

An unhealthy substance, also referred to as trans fat, made through the chemical process of hydrogenation of natural oils. Hydrogenation solidifies liquid oils and boosts the shelf life and the taste stability of essential oils and foods that contain all of them. Trans fat is found in vegetable shortenings and in some margarines, crackers, snacks, snack foods along with other meals.