a combining form meaning “healer,” “medicine,” “healing,” used in the formation of compound words: iatrogenic.

Origin of iatro-

< Greek, combining form of iātrós healer, equivalent to iâ(sthai) to heal + -tros noun suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for iatro-

word-forming element meaning "physician, medicine, healing," from Greek iatro-, comb. form of iatros "healer, physician" (see -iatric).

Online Etymology Dictionary, © 2010 Douglas Harper