supplement

1. Something added; especially, such an addition added to make up for a deficiency. · Near-synonyms: see Thesaurus:adjunct
2. An extension to a document or publication that adds information, corrects errors, or brings up to date.
3. 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. · the literary supplement
4. An angle that, when added to a given angle, makes 180°; a supplementary angle.
5. 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). · 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.
6. A surcharge, additional cost, especially for food in a restaurant. · There is a £2 supplement if you choose the steak.
7. An adjunct that is nonessential, especially a supplementary relative clause.

Plural supplements