Etymology
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pharmaco- 

word-forming element meaning "drug, medicine," also "poison," from Latinized form of Greek pharmakon "drug, poison" (see pharmacy).

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-plasia 
word-forming element in biology and medicine denoting "formation, growth, development," from Modern Latin -plasia, from Greek plasis "molding, formation," from plassein "to mold" (see plasma).
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medico- 

word-forming element meaning "of or pertaining to medical science; from a medical standpoint; pertaining to medicine and," used as a combining form of Latin medicus "physician; healing" (from PIE root *med- "take appropriate measures").

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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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