N-COUNT (尤指上流社会妇女在正式场合佩戴的)冕状宝石头饰 A tiara is a metal band shaped like half a circle and decorated with jewels which a woman of very high social rank wears on her head at formal social occasions; also used of similar ornaments that girls or women wear on their heads. (尤指上流社会妇女在正式场合佩戴的)冕状宝石头饰