9 letters · 17 points in Scrabble
noun a very short time (as the time it takes the eye to blink or the heart to beat)
verb gleam or glow intermittently
verb emit or reflect light in a flickering manner
originFrom Middle English twynkelyng, twynkelynge, equivalent to twinkle + -ing.
Etymology from Wiktionary, CC BY-SA 3.0