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indistinguishable

[in-di-sting-gwi-shuh-buh l] /ˌɪn dɪˈstɪŋ gwɪ ʃə bəl/
adjective
1.
not distinguishable.
2.
indiscernible; imperceptible.
Origin of indistinguishable
1600-1610
1600-10; in-3 + distinguishable
Related forms
indistinguishableness, indistinguishability, noun
indistinguishably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for indistinguishable

indistinguishable

/ˌɪndɪˈstɪŋɡwɪʃəbəl/
adjective
1.
(often postpositive) foll by from. identical or very similar (to): twins indistinguishable from one another
2.
not easily perceptible; indiscernible
Derived Forms
indistinguishability, indistinguishableness, noun
indistinguishably, adverb
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 indistinguishable
adj.

c.1600, from in- (1) "not, opposite of" + distinguishable. Related: Indistinguishably.

Online Etymology Dictionary, © 2010 Douglas Harper
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