mast cell mast brown • mast hoop · · · Info · Definitions · Synonyms · Characters · · mast cell · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) a large connective tissue cell that contains histamine and heparin and serotonin which are released in allergic reactions or in response to injury or inflammation. Synonyms: mast cell, mastocyte, labrocyte. · · Noun Definition 1 Synonyms · · · mastocyte · · Synonym 1 labrocyte · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 l latin small letter l U+006C m latin small letter m U+006D s latin small letter s U+0073 t latin small letter t U+0074