Etymology
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patho- 

before vowels path-, word-forming element in science and technical terms meaning "suffering, disease," from Greek pathos "suffering, disease" (from PIE root *kwent(h)- "to suffer").

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-pathy 

word-forming element meaning "feeling, suffering, emotion; disorder, disease," from Latin -pathia, from Greek -patheia "act of suffering, feeling" (from PIE root *kwent(h)- "to suffer"). Meaning "system of treatment of disease, method, cure, curative treatment" is abstracted from homeopathy (q.v.).

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-itis 

word-forming element in medicine denoting "diseases characterized by inflammation" (of the specified part), Modern Latin, from Greek -itis, feminine of adjectival suffix -ites "pertaining to." Feminine because it was used with an implied nosos "disease," a feminine noun; especially in arthritis (nosos) "(disease) of the joints." Arthritis (16c.) was one of the earliest appearances of the suffix in English and from it the suffix was abstracted in other uses.

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-iasis 

medical Latin word-forming element used in naming diseases, from Greek -asis, abstract noun suffix (often expressing "disease, morbid condition") from the aorist of verbs in -aein. The -i- is connective.

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-osis 

word-forming element expressing state or condition, in medical terminology denoting "a state of disease," from Latin -osis and directly from Greek -osis, formed from the aorist of verbs ending in -o. It corresponds to Latin -atio.

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-path 

word-forming element used in modern formations to mean "one suffering from" (a disease or condition), from Greek pathos "suffering" (from PIE root *kwent(h)- "to suffer"). Also "one versed in" (a certain type of treatment), in which cases it is a back-formation from -pathy in the related sense.

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