A large phagocyte; some are fixed and other circulate in the blood stream WordNet 3.0 & Open English WordNet

Macrophages are a type of white blood cell of the innate immune system that engulf and digest pathogens, such as cancer cells, microbes, cellular debris, and foreign substances, which do not have proteins that are specific to healthy body cells on their surface. Wikipedia

A type of white blood cell that engulfs and digests cellular debris, foreign substances, microbes and cancer cells Wikipedia Disambiguation

Type of white blood cell Wikidata

Cells within the tissues that originate from specific white blood cells called monocytes. OmegaWiki

A white blood cell that phagocytizes necrotic cell debris and foreign material, including viruses, bacteria, and tattoo ink. It presents foreign antigens on MHC II to lymphocytes. Part of the innate immune system. Wiktionary

Type of white blood cell. Wiktionary (translation)