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

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adj. comparative form of pale: more pale

"One image -- the "paler," or more indistinct, one -- is reflected from the surface of the glass, while the other is reflected from the silvered back of the glass."

whiter    yellower    greyer    pinkish    livid    bluer    tawny    stouter    pallid    ashen