retardate

noun
re·​tar·​date | \ri-ˈtär-ˌdāt, -dət\

Definition of retardate 

dated, now often offensive

: a person affected with mental retardation

First Known Use of retardate

1912, in the meaning defined above

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The first known use of retardate was in 1912

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retardate

noun
re·​tar·​date | \ri-ˈtärd-ˌāt, -ət \

Medical Definition of retardate 

often offensive

: a mentally retarded individual

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full of whispering sounds

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