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WordNet (r) 3.0 (2006) (WordNet)

descriptor
n 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" [synonym: {form},
{word form}, {signifier}, {descriptor}]
2: a piece of stored information that is used to identify an
item in an information storage and retrieval system