noun ダウンロード 🔗共有 キチン A complex polysaccharide, a polymer of N-acetylglucosamine, found in the exoskeletons of arthropods and in the cell walls of fungi; thought to be responsible for some forms of asthma in humans. Examples : "The hard shell of the crab is made of chitin. " カニの硬い殻はキチンでできています。 compound substance material chemistry biochemistry biology organism insect medicine physiology anatomy disease AIとチャット語彙ゲーム読解練習