supplement

1. (journalism, scientific literature) An additional section of a newspaper devoted to a specific subject; an additional section of a journal issue, or an additional issue, for a similar purpose.Examples: "the literary supplement"; ""Mid-Lent, and the Enemy grins," remarked Selwyn as he started for church with Nina and the children. Austin, knee-deep in a dozen Sunday supplements, refused to stir; poor little Eileen was now convalescent from grippe, but still unsteady on her legs; her maid had taken the grippe, and now moaned all day: "Mon dieu! Mon dieu! Che fais mourir!""

2. (geometry) An angle that, when added to a given angle, makes 180°; a supplementary angle.

3. (nutrition, bodybuilding) A vitamin, herbal extract, or chemical compound ingested to meet dietary deficiencies or enhance muscular development; the dosage form that conveys or embodies it (e.g., tablet, capsule, pill, powder, beverage).Examples: "Vitamins, minerals, and essential fatty acids must come from either the diet or supplements."; "Menstruators are likelier to need an iron supplement than non-menstruators, whose diet alone is usually sufficient."; "She wasn't getting enough iron, so they prescribed a supplement."

4. (grammar) An adjunct that is nonessential, especially a supplementary relative clause.