7 letters · 15 points in Scrabble
noun a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air
noun the univalent group derived from arsine
originAncient Greek κακώδης (kakṓdēs, “evil-smelling”)
Etymology from Wiktionary, CC BY-SA 3.0