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childproof

or child-proof

[chahyld-proof]
adjective
  1. resistant to being opened, tampered with, or operated by a child: a childproof medicine bottle.
  2. made free of hazard for a child: a childproof home.
  3. made safe from damage by children: a childproof living room free of breakable objects.
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verb (used with object)
  1. to make childproof: to childproof a home.
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Origin of childproof

First recorded in 1955–60; child + -proof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for child-proof

adj.

1933, from child (n.) + proof (n.). As a verb by 1951.

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Online Etymology Dictionary, © 2010 Douglas Harper