7 letters · 10 points in Scrabble
noun something inverted in sequence or character or effect
adjective reversed (turned backward) in order or nature or effect
adjective opposite in nature or effect or relation to another quantity
originRecorded since 1440, from Latin inversus, the past participle of invertere (“to invert”), itself from in- (“against, in”) + vertere (“to turn”).
Etymology from Wiktionary, CC BY-SA 3.0