7 letters · 11 points in Scrabble
noun an isolated area of diminished vision within the visual field
originFrom Late Latin scotoma, from Ancient Greek σκότωμα (skótōma), from σκότος (skótos, “darkness”). By surface analysis, scot- + -oma. The figurative sense is an extension from the literal sense, as if the mind, like an eye, cannot "see" certain things.
Etymology from Wiktionary, CC BY-SA 3.0