Biology Prefixes and Suffixes: (hem- or hemo- or hemato-) Definition: The prefix (hem- or hemo- or hemato-) refers to blood. It is derived from the Greek (haimo-) and Latin (haemo-) for blood. Examples: Hemangioma (hem-angi-oma) - a tumor consisting primarily of newly formed blood vessels. Hematic (hemat-ic) - of or relating to blood. Hematocyte (hemato-cyte) - a blood cell.