• Webster's Revised Unabridged Dictionary
    • v. t Outvenom To exceed in venom.
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Century Dictionary and Cyclopedia
    • outvenom To surpass in venomous or poisonous character.
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Chambers's Twentieth Century Dictionary
    • v.t Outvenom owt-ven′um (Shak.) to exceed in poison.
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In literature:

Whose edge is sharper than the sword whose tongue Outvenoms all the worms of Nile.
"The Leavenworth Case" by Anna Katherine Green