/ Dictionary / Index H hematosis: Meaning and Definition of Find definitions for: he•ma•to•sis Pronunciation: (hē"mu-tō'sis, hem"u-), [key] — n. hematopoiesis. the conversion of venous into arterial blood; oxygenation in the lungs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hematoporphyria hematothermal Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language