Materials placed in cavities of teeth to repair decay, or the mixture of food ingredients inside pastries, sandwiches, or other foods.
From 'fill' (Old English 'fyllan') plus '-ing' (process) plus '-s' (plural). Dental fillings use modern materials like composite resin, while food fillings are as old as cooking itself.
The first dental fillings were made of gold, lead, and even asbestos before we knew better—modern tooth-colored composites are stronger and safer, but a good gold filling can last your whole life!
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