1. (

• mentally_retarded ,
• retarded ,
• developmentally_challenged

) people collectively who are mentally retarded; "he started a school for the retarded" ;

1. (

• retard ,

) cause to move more slowly or operate at a slower rate; "This drug will retard your heart rate" ;

2. (

• retard

) be delayed ;

3. (

• check ,
• retard ,
• delay ,

) slow the growth or development of; "The brain damage will retard the child's language development" ;

4. (

• decelerate ,
• slow ,
• slow_down ,
• slow_up ,
• retard

) lose velocity; move more slowly; "The car decelerated" ;

1. (

• retarded

) relatively slow in mental or emotional or physical development; "providing a secure and sometimes happy life for the retarded" ;