Etymology
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Words related to pathology

*kwent(h)- 

Proto-Indo-European root meaning "to suffer."

It forms all or part of: anthropopathy; antipathy; apathy; empathy; idiopathy; nepenthe; osteopathy; -path; pathetic; -pathic; patho-; pathogenic; pathognomonic; pathology; pathos; -pathy; psychopathic; sympathy.

It is the hypothetical source of/evidence for its existence is provided by: Greek pathos "suffering, feeling, emotion, calamity," penthos "grief, sorrow;" Old Irish cessaim "I suffer;" Lithuanian kenčiu, kentėti "to suffer," pakanta "patience."

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-logy 

word-forming element meaning "a speaking, discourse, treatise, doctrine, theory, science," from Greek -logia (often via French -logie or Medieval Latin -logia), from -log-, combining form of legein "to speak, tell;" thus, "the character or deportment of one who speaks or treats of (a certain subject);" from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Often via Medieval Latin -logia, French -logie. In philology "love of learning; love of words or discourse," apology, doxology, analogy, trilogy, etc., Greek logos "word, speech, statement, discourse" is directly concerned.

pathologic (adj.)

"pertaining to pathology, of or pertaining to disease," 1650s, perhaps modeled on French pathologique; see pathology + -ic.

pathologist (n.)

"one versed in the nature or diagnosis of diseases," 1640s, from pathology + -ist.

psychopathology (n.)

1847, "the science of mental disorders," from psycho- + pathology, on model of German psychopathologie. By 1947 as "a mentally deranged state or condition."