descriptor

[dih-skrip-ter]
noun
1.
a significant word or phrase used to categorize or describe text or other material, especially when indexing or in an information retrieval system.
2.
Computers. a data item that stores the attributes of some other datum: a task descriptor.

Origin:
1930–35, for an earlier sense; describe + -tor, with vowel change and devoicing by analogy with similar L derivatives

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
descriptor

noun
1. the phonological or orthographic sound or appearance of a word that can be used to describe or identify something; "the inflected forms of a word can be represented by a stem and a list of inflections to be attached" [syn: form
2. a piece of stored information that is used to identify an item in an information storage and retrieval system 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences for descriptors
It could be that a unique object was described by several descriptors.
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