confound

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confound

(kŏn-fownd′) [L. confundere, to confuse, to pour together]
1. To introduce bias into a research study.
2. To confuse, bewilder, or mystify. confounding, n.
References in classic literature ?
Pennsylvania may not choose to confound her interests in a connection so adverse to her policy.
But in America, the coins current being the sole arms of the aristocracy, their display may be said, in general, to be the sole means of the aristocratic distinction; and the populace, looking always upward for models,,are insensibly led to confound the two entirely separate ideas of magnificence and beauty.
Take up the spear and shield and arise to help us; confound and put to shame those who have devised evil against us, may they be before the faces of Thy faithful warriors as dust before the wind, and may Thy mighty Angel confound them and put them to flight; may they be ensnared when they know it not, and may the plots they have laid in secret be turned against them; let them fall before Thy servants' feet and be laid low by our hosts
For fifty years they had peeped through that little window and across that trim garden, but never yet had such a sight as this come to confound them.
Combined effect of short-term dehydration and sublethal acute oral dicrotophos exposure confounds the diagnosis of anticholinesterase exposure in common quail (Coturnix coturnix) using plasma cholinesterase activity.
Each of the three terms--American, Academy, Religion--matters acutely to the configuration of this panel; and the panel confounds the capacities of the AAR.
An arresting visual tension of rhyming components excites and confounds.
To control for their possible influence on the dependent variables, the five significant confounds were controlled in the ANCOVA method.