DSL - SND1 TRESTARIG, n. Whisky which has been distilled three times. Gael.
*Hebr.1703 M. MartinDesscr. W. Islands 3:
Their plenty of corn was such, as disposed the natives to brew several sorts of liquor, as common Usquebaugh, another called Trestarig, i.e. Aquavitae, three times distill'd, which is strong and hot.
[Gael. treas-tarruing, id., lit. ``the third distillation.'']