cartilage
car·til·age [cartilage cartilages] BrE [ˈkɑːtɪlɪdʒ] NAmE [ˈkɑːrtɪlɪdʒ] noun uncountable, countable
the strong white ↑tissue that is important in support and especially in joints to prevent the bones rubbing against each other
•I've damaged the cartilage in my knee. 
Word Origin:
late Middle English: from French, from Latin cartilago, cartilagin-.
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