also: はいあおいろ
noun, noun which may take the genitive case particle 'no'
A color term describing a blue with a grayish tone, similar to slate blue or dusty blue.
彼女は灰青色のワンピースを着ていた。
She was wearing a grayish-blue dress.
この絵の具を混ぜると灰青色が作れます。
You can make a grayish blue by mixing these paints.
Compound of 灰 (hai, 'gray') + 青 (sei, 'blue') + 色 (shoku, 'color'). The reading かいせいしょく is the standard on-yomi compound reading.