The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.
俚語A rack of thirty beers.
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From Middle English thirty, metathetic alternant of Middle English thritti, þrittiȝ, from Old English þritiġ (“thirty”), from Proto-Germanic *þrīz tigiwiz (“thrity”, literally “three tens”), equivalent to three + -ty. Cognate with Scots therty, tretty (“thirty”), West Frisian tritich (“thrity”), Dutch dertig (“thrity”), German dreißig (“thirty”).
- 維基詞典 :thirty (CC BY-SA 3.0)