'lymphocytic' originates from Neo-Latin/modern medical formation, specifically from the combining form 'lympho-' (from Latin 'lympha') and the Greek root 'kytos', where 'kytos' meant 'cell', with the adjectival suffix '-ic'.

'lymphocytic' developed from the noun 'lymphocyte' (from Neo-Latin 'lymphocytus') plus the adjectival suffix '-ic', and eventually became the modern English adjective 'lymphocytic'.

Initially, it meant 'of or relating to lymphocytes', and over time this meaning has remained largely unchanged in modern usage.