Definition of lymphocyte
: any of the colorless weakly motile cells originating from stem cells and differentiating in lymphoid tissue (as of the thymus or bone marrow) that are the typical cellular elements of lymph, include the cellular mediators of immunity, and constitute 20 to 30 percent of the white blood cells of normal human blood — compare b cell, t cell
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Merriam-Webster unabridged
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Time Traveler for lymphocyte
The first known use of lymphocyte was in 1890
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