intoxicate comes from Medieval Latin intoxicatus, past participle of intoxicare ('to poison'), from in- ('into') + toxicare ('to poison'), from Latin toxicum ('poison'), from Greek toxikon (pharmakon) ('poison for arrows'). Morphologically, the prefixed shape matters: the initial element belongs to the recorded formation and helps explain the modern form's surface analysis. In present English, the verb sense is "to make drunk; to excite or elate beyond self-control", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as toxic, toxin, and detoxify, and in derivatives such as intoxication, intoxicant, and intoxicated. Its semantic neighborhood includes inebriate, exhilarate, elate, and stupefy, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin intoxicare and Ancient Greek toxikón.