helper T cellhelper T cell
a type of T cell that helps coordinate the immune response, especially by activating B cells: the AIDS virus targets and destroys these T cells
helper T cell
also helper cell
Any of the T cells that carry the CD4 glycoprotein receptor on their surface and that when stimulated by foreign antigens release lymphokines that promote the activation and function of B cells and killer T cells. Also called CD4 cell, T4 cell, T-helper cell.