This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. a reddening.

n. The quality or state of being rubescent; a reddening; a flush.

n. A growing rubescent or red; the state of becoming or being red; a blush.

"At the foot of this tree sat Tibbie Dyster; and from her red cloak the level sun-tide was thrown back in gorgeous glory; so that the eyeless woman, who only felt the warmth of the great orb, seemed, in her effulgence of luminous red, to be the light-fountain whence that torrent of rubescence burst."

reddening    flush