Noun
a cell that develops from a B lymphocyte in reaction to a specific antigen; found in bone marrow and sometimes in the blood
Source: WordNetMultiple myeloma is a cancer that arises from a type of white blood cell called a plasma cell. Source: Internet
The tests may also show evidence of substantial lymphocyte (white blood cell in the vertebrate immune system), plasma cell, and neutrophil (the most abundant type of white blood cells) infiltration. Source: Internet