The soft, fatty tissue inside the cavities of bones where blood cells are produced.

हड्डी का मज्जा

English Usage: The doctor explained that the transplant would involve healthy bonemarrow from a donor.

Hindi Usage: डॉक्टर ने बताया कि प्रत्यारोपण में एक दाता से स्वस्थ हड्डी का मज्जा शामिल होगा।