'anisoleukocytosis' originates from Greek roots: 'anisos' meaning 'unequal', 'leukos' meaning 'white', 'kytos' meaning 'cell', and the suffix '-osis' indicating a medical condition.

'anisoleukocytosis' was formed in modern medical/Neo-Latin usage by combining the Greek-derived prefix 'aniso-' with 'leukocytosis' (from 'leukos' + 'kytos' + '-osis'), producing a compound term used in hematology to describe unequal white blood cells.

Initially the component 'aniso-' simply meant 'unequal'; over time, when combined with hematological elements like 'cytosis' or 'cyt-' it has come to denote variation in cell size or form — hence the current meaning referring specifically to unequal (variable-sized) white blood cells.