Something that fattens; especially feed or grain given to animals to make them gain weight, or a person who fattens animals.
From the verb 'fatten' plus the suffix '-er' (one who does or something that does), creating a noun for agents of fattening.
In industrial farming, 'fattener' refers to high-calorie grain supplements—corn and soy 'fatteners' have become so efficient that they've fundamentally changed how farms operate and how fast animals grow.
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