10 letters · 11 points in Scrabble
noun someone who offers opposition
noun a muscle that relaxes while another contracts
noun a drug that neutralizes or counteracts the effects of another drug
originFrom Latin antagonista, from Ancient Greek ἀνταγωνιστής (antagōnistḗs, “opponent”) (ἀντί (antí, “against”) + ἀγωνιστής (agōnistḗs, “a combatant, pleader, actor”)), from ἀνταγωνίζομαι (antagōnízomai, “to antagonize”).
Etymology from Wiktionary, CC BY-SA 3.0