Sacrum/ˈseɪkrəm/ Definition 1 of 1Pro Tip 1/3Location Clarity The sacrum is the link between your lumbar spine and tailbone. He felt pain right above the tailbone, in the sacrum area. Pro Tip 2/3Pronunciation Pronounced as 'SAE-krəm', with stress on the first syllable. After the fall, they discovered her sacrum was fractured. Pro Tip 3/3Medical Context Sacrum is often mentioned in medical or anatomical discussions, not in everyday conversation. The MRI showed an anomaly in the sacrum.