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defect

[n. dee-fekt, dih-fekt; v. dih-fekt] /n. ˈdi fɛkt, dɪˈfɛkt; v. dɪˈfɛkt/
noun
1.
a shortcoming, fault, or imperfection:
a defect in an argument; a defect in a machine.
2.
lack or want, especially of something essential to perfection or completeness; deficiency:
a defect in hearing.
3.
Also called crystal defect, lattice defect. Crystallography. a discontinuity in the lattice of a crystal caused by missing or extra atoms or ions, or by dislocations.
verb (used without object)
4.
to desert a cause, country, etc., especially in order to adopt another (often followed by from or to):
He defected from the U.S.S.R to the West.
Origin
late Middle English
1375-1425
1375-1425; late Middle English < Latin dēfectus failure, weakness, equivalent to dēfec- variant stem of dēficere to run short, fail, weaken (see deficient) + -tus suffix of v. action
Related forms
defectible, adjective
defectibility, noun
defectless, adjective
nondefecting, adjective
predefect, noun
redefect, verb (used without object)
Synonyms
1. Defect, blemish, flaw refer to faults that detract from perfection. Defect is the general word for any kind of shortcoming or imperfection, whether literal or figurative: a defect in eyesight, in a plan. A blemish is usually a defect on a surface, which mars the appearance: a blemish on her cheek. Flaw is applied to a defect in quality, caused by imperfect structure (as in a diamond) or brought about during manufacture (as in texture of cloth, in clearness of glass, etc.).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for defectless

defect

noun (dɪˈfɛkt; ˈdiːfɛkt)
1.
a lack of something necessary for completeness or perfection; shortcoming; deficiency
2.
an imperfection, failing, or blemish
3.
(crystallog) a local deviation from regularity in the crystal lattice of a solid See also point defect, dislocation (sense 3)
verb (dɪˈfɛkt)
4.
(intransitive) to desert one's country, cause, allegiance, etc, esp in order to join the opposing forces
Derived Forms
defector, noun
Word Origin
C15: from Latin dēfectus, from dēficere to forsake, fail; see deficient
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for defectless
defect
early 15c., from L. defectus "failure, revolt," from pp. of deficere "to fail, desert" (see deficient).
Online Etymology Dictionary, © 2010 Douglas Harper
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defectless in Medicine

defect de·fect (dē'fěkt', dĭ-fěkt')
n.
A lack of or abnormality in something necessary for normal functioning; a deficiency or imperfection.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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