This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Azure; sky-blue.

n. sky blue.

adj. sky-blue.

adj. Sky-colored; blue; azure.

Sky-colored; clear lightblue; blue. Also spelled cærulean.

n. Blue; cerulean color.

n. A blue-stocking.

n. a light shade of blue

adj. of a deep somewhat purplish blue color similar to that of a clear October sky

"Although likely only a Duke grad would use the word "cerulean" in casual conversation, and although rumor has it that Nebiros was, in fact, a UNC fan, the correct answer is C."

chromatic   

blueness    blue   

cerulean warbler    cerulean blue   

sky-colored    blue    azure   

bluer    greenish-blue    sapphirine    dove-colored    ice-blue    aureate    dark-blue    opalescent    roseate    chalcedony