detect

[dih-tekt]
verb (used with object)
1.
to discover or catch (a person) in the performance of some act: to detect someone cheating.
2.
to discover the existence of: to detect the odor of gas.
3.
to find out the true character or activity of: to detect a spy.
4.
Telecommunications.
a.
to rectify alternating signal currents in a radio receiver.
b.
to demodulate.

Origin:
1400–50; late Middle English < Latin dētēctus (past participle of dētegere), equivalent to dē- de- + teg(ere) to cover + -tus past participle suffix

detectable, detectible, adjective
detectability, detectibility, noun
predetect, verb (used with object)
undetectable, adjective
undetectably, adverb
undetected, adjective
undetectible, adjective


2. See learn.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To undetected
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World English Dictionary
detect (dɪˈtɛkt)
 
vb
1.  to perceive or notice: to detect a note of sarcasm
2.  to discover the existence or presence of (esp something likely to elude observation): to detect alcohol in the blood
3.  to extract information from (an electromagnetic wave)
4.  obsolete to reveal or expose (a crime, criminal, etc)
 
[C15: from Latin dētectus uncovered, from dētegere to uncover, from de- + tegere to cover]
 
de'tectable
 
adj
 
de'tectible
 
adj
 
de'tecter
 
n

undetected (ˌʌndɪˈtɛktɪd)
 
adj
not perceived, noticed, or discovered: the fake bomb passed undetected

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

detect
mid-15c., from L. detectus, pp. of detegere "uncover, disclose," from de- "un-, off" + tegere "to cover" (see stegosaurus).

undetected
c.1593, from un- (1) "not" + pp. of detect. Undetectable is recorded from 1863.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But this inattention can leave skin cancers undetected.
When an outbreak occurs undetected in a facility, viruses can mutate as they
  cycle through large flocks or herds.
Some new physical interactions at high energies, as yet undetected, are needed
  to resolve this fascinating puzzle.
Also, some of them could have arrived years earlier undetected.
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