【化】 crown ether
coronal; coronet; crest; hat; precede; put on a hat; the best【计】 corona【医】 corona; coronae; crown; pileus; pilleus
aether; ether【化】 aether; diethyl ether; ether; ethyl ether【医】 aether; aethylis oxidum; ether; naphtha vitrioli