sequaniumEtymologyLearned borrowing from Latin Sequana (“the river Seine”) + -ium. Horia Hulubei, who thought he had discovered element 93, worked near the river at that time.sequanium means an early name for the element neptunium, based on a discredited claim of discovery. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounAn early name for the element neptunium, based on a discredited claim of discovery.