† ounce tronn. [ < ouncen.1 + tronn.] ScottishObsoleterare a public weighing apparatus in a city or burgh used for measuring quantities of one ounce.
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c1580 in J. D. Marwick Extracts Rec. Burgh Edinb. (1869) I. 166 Quhat cost or expenssis that the saidis fermoraris of the petie customes makis vpoun fyrlottis, pekkis, and on the vnce trone.