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Webster 1913 Edition

Noun.

One who confounds.

Noun.

One who confounds; one who disturbs the mind, perplexes, refutes, frustrates and puts to shame or silence; one who terrifies.

confounder ‎(plural confounders)

A person who confounds
(mathematics) A factor, in data analysis, that causes the effects of two distinct processes to be indistinguishable; a confounding variable