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petroleum jelly

noun
🔊/ˌpetrəˈleɪtəm/
🔊/ˌpetrəˈleɪtəm/
(North American English also petrolatum )
[uncountable]
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  1. a soft clear substance obtained from petroleum, used to heal (= make better) injuries on the skin or to make machine parts move together more smoothly 矿脂；凡士林synonym Vaseline™