Submitted by György Chityil ... on Fri, 01/19/2018 - 18:41 Hierarchy: NounDescription: {{immunology}} One of several blood proteins that work with antibodies during an immune response. {{defdate|from 20th c.}}Ngram: complementNgram Text: complementSource: WiktionaryIssue: 0Wiktionary tag: immunologyfrom 20th c.Ngram Count: 1