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retarded
optical

re·tard·ed

retarded

 
pronunciation:
rih tar dihd
features:
Word Combinations (adjective)
part of speech: adjective
definition 1: (outdated; no longer in scientific use; often considered offensive) comparatively slow or deficient in intellectual growth.
antonyms:
precocious
definition 2: showing a rate of advancement that is slower than the norm.
The child's retarded physical development was noted by the doctors.
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