Etymology
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iatro- 
word-forming element meaning "a physician; medicine; healing," from Greek iatros "healer, physician" (see -iatric).
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phlebo- 

word-forming element in medicine meaning "a vein or veins," from Greek phlebo-, combining form of phleps "vein," a word of uncertain origin.

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leuko- 
before vowels leuk-, also sometimes in Latinized form leuco-/leuc-, word-forming element used from 19c. and meaning "white" (or, in medicine, "leukocyte"), from Greek leukos "clear, white," from PIE *leuko-, suffixed form of root *leuk- "light, brightness."
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