The term 'bone starter' refers to the five bones that make up the human arm and leg. OSTEO (5 letters) is the medical term for bone, OSTE (4 letters) is a variation of the word, TIBIA (5 letters) is the larger of the two bones in the lower leg, ULNA (4 letters) is the larger of the two bones in the forearm, and ULNAR (5 letters) is a variation of the word. Together, these five bones form the foundation of the human arm and leg.