What does antiparasitic mean?
Antiparasitic describes anything that acts against parasites — organisms that live on or in a host and draw nourishment at its expense, including intestinal worms, single-celled protozoa, and external pests like lice and mites. The word functions both as an adjective, describing a substance or treatment with this property, and as a noun, denoting the drugs themselves. In medicine and veterinary practice, antiparasitic agents are indispensable: they underpin the treatment of malaria, sleeping sickness, river blindness, and common worm infestations worldwide. The term carries a clinical, technical tone and appears most often in prescriptions, research literature, and public-health contexts rather than casual conversation. Its etymology is revealing: the prefix 'anti-' comes from Greek, meaning 'against', while 'parasite' derives from the Greek parasitos, originally describing one who dines at another's table — a fittingly vivid origin for organisms that feed off their hosts.
Having the quality of acting against, killing, or inhibiting parasites.
"This ointment has proven antiparasitic properties against scabies mites."
A drug or agent used to destroy or inhibit parasites, especially protozoa, helminths, and ectoparasites.
"Ivermectin is a widely used antiparasitic in both human and veterinary medicine."
Usually used in the plural when referring to the drug class generally.
Used when referring collectively to the class of antiparasitic drugs.
"The pharmacy stocks a range of antiparasitics for treating tropical infections."
The word joins the Greek prefix meaning 'against' with a term whose original sense was 'one who eats at another's table' — parasites were literally named for freeloading dinner guests.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of antiparasitic
The word combines the Greek-derived prefix 'anti-', meaning 'against' or 'opposed to', with 'parasitic', which traces back to the Greek noun parasitos — literally 'one who eats at another's table', a term applied in ancient Greece to professional dinner guests before being adopted by biologists in the eighteenth century to describe organisms living off a host. The compound 'antiparasitic' emerged in modern medical usage as pharmacology developed dedicated treatments for parasitic diseases. It shares its roots with related terms such as parasitology, the scientific study of parasites, and sits alongside sibling compounds like antibiotic and antifungal, formed on the same 'against' pattern.
Related word forms
How antiparasitic is actually used
The word belongs chiefly to medical, pharmacological, and veterinary registers. As a noun it usually appears in plural form when referring to a class of drugs ('the antiparasitics'), and in singular form when naming a specific agent.
Easily confused with antiparasitic
An antibiotic acts against bacteria, whereas an antiparasitic acts against parasites such as worms, protozoa, and mites.
An antifungal targets fungal infections, while an antiparasitic targets parasitic organisms.