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

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v. Simple past tense and past participle of leather.

adj. resembling or made to resemble leather; tough but pliable

"With interstatial lung disease, Janine said, the lungs become "leathered" and less able to absorb oxygen."

leathered    leathering    leathers   

strap    welt    slash    trounce    flog    lather    lash    whip   

hogs' leather    basan leather    bullock-leather    russet leather    kip-leather    enameled leather    hungarian leather    leather-measuring machine    whang-leather    split leather   

leathered    leathering   

chamois    shammy    kid    dogskin    calfskin    calf    cowhide    doeskin    pigskin    porpoiseskin   

Heather    altogether    feather    get-together    heather    nether    tether    together    weather    whether   

silk    cloth    plastic    canvas    wool    metal    fur    boot    hide    skin