[pyoo-er-uh-liz-uhm, pyoor-uh-]
noun Psychiatry.
childishness in the behavior of an adult.

1920–25; puerile + -ism

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World English Dictionary
puerilism (ˈpjʊərɪˌlɪzəm)
psychiatry immature or childish behaviour by an adult

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

puerilism pu·er·il·ism (pyōō'ər-ə-lĭz'əm, pyur'ə-)
Childish behavior in an adult, especially as a symptom of mental illness.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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