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The emergence of an adult insect from a pupal case or an insect larva from an egg.
[French éclosion, from éclore, to open, from Old French, from Vulgar Latin *exclaudere, to shut out : Latin ex-, ex- + Latin claudere, to shut.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Zoology) the emergence of an insect larva from the egg or an adult from the pupal case
[C19: from French éclosion, from éclore to hatch, ultimately from Latin exclūdere to shut out, exclude]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. the emergence of an adult insect from its pupal case.
2. the hatching of a larva from its egg.
[1885–90; < French éclosion, derivative of éclos, past participle of éclore to hatch]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.