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[in-fuh n-tahyl, -til] /ˈɪn fənˌtaɪl, -tɪl/

characteristic of or befitting an ; babyish; childish:
infantile behavior.
of or relating to or :
infantile diseases.
Physical Geography. (def 5).
like a child in action or behaviour; childishly immature; puerile
of, relating to, or characteristic of infants or infancy
in an early stage of development

mid-15c., “pertaining to infants,” from Latin infantilis “pertaining to an infant,” from infans (see infant). Sense of “infant-like” is from 1772.

infantile in·fan·tile (ĭn’fən-tīl’, -tĭl)


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  • Infantile-autism

    noun, Psychology. 1. a disorder appearing in children before the age of two and a half, characterized by lack of interest in others, impaired communication skills, and bizarre behavior, as ritualistic acts and excessive attachment to objects. infantile autism n. A severe disorder of childhood characterized by withdrawal, preoccupation with fantasy, language impairment, and abnormal […]

  • Infantile cortical hyperostosis

    infantile cortical hyperostosis n. A painful thickening of membrane surrounding soft bone tissue, especially in the mandible, the clavicles, and the shafts of long bones, following fever and usually appearing before six months of age and disappearing during childhood. Also called Caffey’s disease, Caffey’s syndrome.

  • Infantile digital fibromatosis

    infantile digital fibromatosis n. See recurring digital fibroma of childhood.

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