• Webster's Revised Unabridged Dictionary
    • Outroot To eradicate; to extirpate.
    • Outroot To root louder than; to applaud more noisily than.
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Century Dictionary and Cyclopedia
    • outroot To excel in rooting.
    • outroot To uproot; root out.
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Chambers's Twentieth Century Dictionary
    • v.t Outroot owt-rōōt′ to root out.
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In literature:

John was not less active in outrooting all that he thought heresy.
"History Of Egypt From 330 B.C. To The Present Time, Volume 11 (of 12)" by S. Rappoport