巨きょ核かく球きゅうMeanings1nounmegakaryocyteMedical term for a large bone marrow cell that produces platelets.巨きょ核かく球きゅうは骨こつ髄ずいで血けっ小しょう板ばんを産さん生せいする。Megakaryocytes produce platelets in the bone marrow.