obsolescent

[ob-suh-les-uhnt] Origin

ob·so·les·cent

[ob-suh-les-uhnt]
adjective
1.
becoming obsolete; passing out of use, as a word: an obsolescent term.
2.
becoming outdated or outmoded, as machinery or weapons.
3.
Biology. gradually disappearing or imperfectly developed, as vestigial organs.

Origin:
1745–55; < Latin obsolēscent- (stem of obsolēscēns, present participle of obsolēscere to fall into disuse). See obsolete, -escent

ob·so·les·cent·ly, adverb

1. archaic, obsolescent, obsolete; 2. obsolescent, obsolete.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Obsolescent is always a great word to know.
So is zygote. Does it mean:
the merging of two or more cells into a single cell
the cell produced by the union of two gametes before it undergoes cleavage or cell division
Collins
World English Dictionary
obsolescent (ˌɒbsəˈlɛsənt)
 
adj
becoming obsolete or out of date
 
[C18: from Latin obsolescere; see obsolete]
 
obso'lescence
 
n
 
obso'lescently
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

obsolescent
1755, from L. obsolescentum (nom. obsolescens), prp. of obsolescere "fall into disuse" (see obsolete).
Online Etymology Dictionary, © 2010 Douglas Harper
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