noun 다운로드 🔗공유 천골 A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood. Examples : "The doctor examined the patient's lower back, focusing on the sacrum where it connected to the pelvis. " 의사는 환자의 허리 아래쪽을 검사하며 골반과 연결되는 천골에 집중했다. anatomy body medicine physiology part structure human organ AI와 채팅어휘 게임독해 연습