'ascaricidal' originates from New Latin, specifically the word 'Ascaris' (a genus name for certain roundworms) combined with the Latin-derived suffix '-cidal' (from 'caedere', meaning 'to kill').

'ascaricidal' developed from New Latin formations such as 'Ascaris' + '-cidus'/'-cidal' and from related English terms like 'ascaricide' (a substance that kills Ascaris), eventually becoming the modern English adjective 'ascaricidal'.

Initially, it meant 'intended to kill Ascaris (roundworms)', and over time it has retained that specialized medical sense of 'causing death of Ascaris'.