The emergence of an adult insect from a pupal case or an insect larva from an egg.
[Frenchéclosion, froméclore, to open, fromOld French, fromVulgar Latin*exclaudere, to shut out : Latinex-, ex- + Latinclaudere, to shut.]
(click for a larger image)eclosion
a queen butterfly, Danaus glippus, emerging from its chrysalis
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.