mesophile

noun
me·so·phile | \ˈmez-ə-ˌfīl, ˈmēz-, ˈmēs-, ˈmes-\
variants: also mesophil \-ˌfil \

Medical Definition of mesophile 

: an organism growing at a moderate temperature (as bacteria that grow best at about the temperature of the human body) — compare psychrophile, thermophile

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