large granular lymphocyte

initialism: LGL
https://doi.org/10.1351/goldbook.13374
Lymphocyte of greater than normal size that contains cytoplasmic granules and functions as a natural killer (NK) cell or killer (K) cell. Activated CD8+ cytotoxic T lymphocytes (CTL, Tc) also assume an LGL morphology.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1200 [Terms] [Paper]