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adjective- Mentally retarded. Studies have shown that roughly one in every thousand babies are born with at least part of an extra chromosome number 21, in addition to the two that everyone has. This causes Down Syndrome, and some level of retardation.
Did you see that girl hit herself in the face with a hammer? She's 1 in 1000.

by Wallydraigle January 02, 2007

Words related to 1 in 1000

retarded 1 in 100 chromosome 21 down syndrome smart