puer·ile (pyrīl′, pwĕr-, pyər-, -əl)
1. Immature, especially in being silly or trivial; childish. See Synonyms at young.
2. Archaic Belonging to childhood; juvenile.
[Latin puerīlis, from puer, child, boy; see pau-1 in the Appendix of Indo-European roots.]
puer′ili·ty (-ĭlĭ-tē), puerile·ness (-əl-nĭs, -īl-) n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.