triple distillation (full and partial)
From The Oxford Companion to Spirits & Cocktails
, a process in which a spirit (or some component of the finished product) undergoes three distillations, is common practice in whisky distilleries in Ireland, though it is also employed by a few distilleries in Scotland. See also distillation, process; Scotland, Ireland;, whisky.
This definition is from The Oxford Companion to Spirits & Cocktails, edited by David Wondrich (Editor-in-Chief) and Noah Rothbaum (Associate Editor).