"1 more than seventy-nine, twice forty; the number which is one more than seventy-nine; a symbol representing this number;" late 13c., eigteti, from eight + -ty (1). Replacing Old English hundeahtatig, with hund- "ten." Related: Eightieth.
eighteen
eighteenth
eightfold
eighth
eighties
eighty
eighty-six
Eileen
Einstein
einsteinium
Eire
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