We found 9 dictionaries that define the word mentally handicapped:

General (7 matching dictionaries)

1. mentally handicapped: Longman Dictionary of Contemporary English
2. mentally handicapped: Oxford Learner's Dictionaries
3. mentally handicapped, the mentally handicapped: Collins English Dictionary
4. Mentally handicapped: Wikipedia, the Free Encyclopedia
5. mentally handicapped: Wiktionary

Computing (1 matching dictionary)

6. Mentally handicapped: Encyclopedia

Medicine (1 matching dictionary)

7. Mentally handicapped: Medical dictionary

Definitions from Wiktionary (mentally handicapped) ▸ adjective:  Having a brain condition that impairs the ability to think or control the body. ▸ Words similar to mentally handicapped ▸ Usage examples for mentally handicapped ▸ Idioms related to mentally handicapped ▸ Wikipedia articles (New!) ▸ Popular nouns described by mentally handicapped ▸ Words that often appear near mentally handicapped ▸ Rhymes of mentally handicapped ▸ Invented words related to mentally handicapped