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

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v. Present participle of suntan.

"Skin cancer, which is a very common kind of cancer, is often caused by over exposure to sun or other uv radiation, such as suntanning beds."

suntanned    suntanning    suntans   

bronze    tan    hyperpigmentation   

calamine    after-shave    tabi    Westinghouse    vanilla-infused