retardism en · NOUN
Etymology
From retard + -ism.
Meanings
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(dated, uncountable) Mental retardation
Chapter titles reveal attention to specific areas of emotional disability, including behavior disorders; symptomatic autism in adolescence; pseudo-retardism; school refusal; anorexia nervosa; and passive, aggressive, selective mutes.
1974, Childhood Education, volume 51, page 226:Epileptic seizures are rather common among the mentally retarded, but are considered to be concomitant with the retardism rather than a cause of it.
1972, Charles W. Telford, James M. Sawrey, The Exceptional Individual, page 373: