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[From Latin Thrasō, a braggart soldier in the play Eunuchus by Terence, from Greek Thrasōn, Greek male name used in comedy, from thrasus, bold, rash, arrogant; akin to Old English durran, to dare, and Czech and Slovak drzý, insolent.]
(Literary & Literary Critical Terms) rare bragging; boastful
[C16: from Latin Thrasō name of boastful soldier in Eunuchus, a play by Terence, from Greek Thrasōn, from thrasus forceful]
thra•son•i•cal(θreɪˈsɒn ɪ kəl)
[1555–65; < Latin Thrasōn-, s. of Thrasō braggart in Terence's Eunuchus]