'antivenomic' originates from modern English, specifically the word 'antivenom' with the adjectival suffix '-ic'; 'anti-' meant 'against' (from Greek/Latin usage) and 'venom' comes from Latin 'venenum' meaning 'poison'.

'venom' came into English from Old French 'venin', itself from Latin 'venenum'; the formation 'antivenom' (anti- + venom) arose in modern English (20th century medical usage), and adding '-ic' produced the adjective 'antivenomic'.

Initially the elements meant 'against poison' (anti- + 'venenum' = against poison), but over time the compound came to mean 'relating to antivenom' or more specifically 'relating to the study/analysis of antivenom activity' (antivenomics).