plaque-forming cell

initialism: PFC
https://doi.org/10.1351/goldbook.13574
Antibody-secreting plasma cell detected in vitro by its ability to produce a "plaque" of lysed antigen-sensitized erythrocytes in the presence of complement.
See also: plaque assay
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1229 [Terms] [Paper]