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silicone

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silicone/ˈsɪləˌkoʊn/noun
silicone
/ˈsɪləˌkoʊn/
noun
Learner's definition of SILICONE  
[noncount]
: a chemical that does not let water or heat pass through and that is used to make rubber and grease and in plastic surgery — often used before another noun
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