Etymology
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hemo- 
word-forming element meaning "blood," perhaps via Old French hemo-, Latin haemo-, from Greek haimo-, contraction of haimato-, combining form of haima "blood" (see -emia).
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hemato- 
also haemato-, before vowels hemat-, haemat-, word-forming element in scientific compounds meaning "blood," from Greek haimato-, combining form of haima (genitive haimatos) "blood" (see -emia). Compare hemo-.
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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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