THIRTY
Source: 566, 567
thirty. Thirty, [thurty] a. twenty and ten, ten repeated thrice
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Thir″ty (?), a. [[OE. thritty, AS. þrītig, þrittig; akin to D. dertig, G. dreissig, Icel. þrjātīu, þrjātigi, þrir teger, Goth. þreis tigjus, i.e., three tens. See Three, and Ten, and cf. Thirteen.]] Being three times ten; consisting of one more than twenty-nine; twenty and ten; as, the month of June consists of thirty days.