Lymphopoiesis

Lymphopoiesis (lĭm'fō-poi-ē'sĭs) refers to the generation of lymphocytes, one of the five different types of white blood cells (WBC), and is also more formally called lymphoid hematopoiesis.

Lymphopoiesis Glossary
antigen any molecule that can provoke an immune defense
B cells lymphocytes that ultimately produce antibodies
bone marrow the center of bones capable of producing all red and white blood cells in the adult
cortex the outer portion of any organ
cytoplasm the portion of a cell between the nucleus and the membrane
differentiation permanent changes to a cell developing over time and with cell division
granules grains found in many white blood cells, composed of defensive chemicals
hematopoietic that which gives rise to any blood cell type
lineage a type of cell and its descendants by division and differentiation
lymphocytes a special 'lineage' of WBC
macrophages myeloid descendants (some may be lymphoid) with 'eating' abilities, also cooperate with lymphocytes
myeloid ancestors of WBCs with granules and also of macrophages
T Cells "management" lymphocytes for immunity
(WBC) White Blood Cell in contrast to the much more common Red Blood Cell; responsible for defense

Read more about Lymphopoiesis:  The Name Lymphopoiesis, The Purpose of Lymphopoiesis, Overview of Lymphopoiesis, The Process of Lymphopoiesis, Graphical View of The Old Model Vs Mixed Myelo-Lymphoid Model, General Immunology Reference Texts