Blood; No standard medical morpheme -em- exists as a prefix or suffix with independent meaning in modern terminology; searches across standard references yield no entries. It may represent a misremembered or transitional element within Greek/Latin compounds—most likely alluding to -emia (“blood condition,” e.g., anemia, leukemia) or hemo-/hem- (“blood”) where -em- serves as a phonetic bridge between roots. If from a specific term you’re referencing (e.g., embolism, emphysema), clarify and I can break that word down instead.
greek haima, haimatos; - No direct etymology for isolated -em-; if related to -emia, derives from Greek haima (αἷμα) “blood” + abstract noun suffix -ia.
In hemo- forms, -em- reflects Greek stem variation (haim-, hem-) before vowels/consonants for euphony.
Common in hematology terms but not a detachable prefix/suffix like -itis or -ectomy.