What elements name comes from the Greek word for violet?

Question
What links Steve McQueen Ian Botham Spike Milligan?
Answer
All called Terence

Question
What is phonetic alphabet word for U
Answer
Uniform

Question
What is a wumph?
Answer
Deep thud or noise

Question
What is a cathedra?
Answer
Bishops throne or chair

Question
In Greek mythology who were the guardian spirits of the sea?
Answer
Neriads