Home/Topics/General Medical Terms/tailbone General Medical Terms Bones, Joints & Muscles tailbone Listen Save Share Print Meaning of tailbone: The small bone at the bottom of the spine. Definition of tailbone The small bone at the bottom of the spine. It is made up of 3-5 fused bones. Also called coccyx. Written and maintained by James Murray · Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations. Keep exploringRelated termsMore in General Medical Terms → Anatomy & Physiology clavicle The only bony strut between the arm and the trunk, lying under thin skin where it can be seen and felt along its whole length. Read definition → Infection & Immunity cellulitis Redness appearing on both legs at once is rarely cellulitis, since the infection almost always settles on one side only. Read definition → Diseases & Disorders gout An arthritis caused by crystals rather than by wear, which is why it arrives overnight and can leave the joint untouched between attacks. Read definition → Biological & Chemical Substances magnesium Leafy greens, nuts, seeds, beans and whole grains supply it, and the kidneys decide how much of it stays. Read definition →
Anatomy & Physiology clavicle The only bony strut between the arm and the trunk, lying under thin skin where it can be seen and felt along its whole length. Read definition →
Infection & Immunity cellulitis Redness appearing on both legs at once is rarely cellulitis, since the infection almost always settles on one side only. Read definition →
Diseases & Disorders gout An arthritis caused by crystals rather than by wear, which is why it arrives overnight and can leave the joint untouched between attacks. Read definition →
Biological & Chemical Substances magnesium Leafy greens, nuts, seeds, beans and whole grains supply it, and the kidneys decide how much of it stays. Read definition →