noun ダウンロード 🔗共有 尾骨 The final (bottom-most) fused vertebrae at the base of the spine, the tailbone. Examples : "After falling on the ice, she felt a sharp pain in her coccyx. " 氷の上で転んだ後、彼女は尾骨に鋭い痛みを感じた。 anatomy body medicine physiology organ part structure AIとチャット語彙ゲーム読解練習