noun, plural: agranular leukocytes
Leukocytes may be classified as either granular or agranular in terms of cytoplasmic granules. Agranular leukocytes lack the apparent granules when viewed under a light microscope. In comparison, granular leukocytes have evident granules in their cytoplasm. Although agranular leukocytes seem to lack granules they do, in fact, have non-specific azurophilic granules. However, these granules are much less evident under the light microscope.