windowpanes

Noun

windowpane (plural windowpanes)

1. A piece of glass filling a window or a section of a window.
2. A fabric pattern of widely-spaced intersecting vertical and horizontal lines forming large squares.
   • As for patterns, solids are the most formal, followed by stripes, nailhead, and birdseye (tiny, frequent dots on a darker background; nailhead is smaller and squarer), pic-and-pic (tiny, staggered diagonal lines, like miniature staircases), herringbone, windowpane, houndstooth, and glen plaid.2006, Nicholas Antongiavanni [pseudonym; Michael Anton], The Suit: A Machiavellian Approach to Men's Style, New York: HarperCollins Publishers, →ISBN, →OCLC, page 81
3. (slang) A gelatin base tab with LSD.
   • Another form is called a windowpane. Windowpanes are small thin squares of gelatin treated with LSD that look like little pieces of plastic.2004, Mary M. Jensen, Introduction to Emotional and Behavioral Disorders, page 94