It is the past participle used as an adjective.
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EnglishmavenIt is the past participle... of the verb "to member"?
ThaiUIlearnerThere is very little to explain except that nouns that refer to parts of things (usually parts of the body) sometimes take an -ed ending. These often occur preceded by numbers, and they form hyphenated adjectives.how to grammatically explainHow can we explain the grammar of ...