Mizuwari
From The Oxford Companion to Spirits & Cocktails
is a Japanese take on a highball, with ritualistic attention paid to the adding and stirring of ice, whisky, and—where it differs from the American highball—uncarbonated mineral water. See Highball, whisky.
This definition is from The Oxford Companion to Spirits & Cocktails, edited by David Wondrich (Editor-in-Chief) and Noah Rothbaum (Associate Editor).