Definition of pathological
1
: of or relating to pathology
pathological research A pathological examination led to the diagnosis.
2
: altered or caused by disease
pathological changes in the body
also
: indicative of disease
pathological symptoms
3
: being such to a degree that is extreme, excessive, or markedly abnormal
a pathological liar pathological fear
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Merriam-Webster unabridged
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Time Traveler for pathological
The first known use of pathological was in 1656
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