say it: di-SKRIP-tur
descriptor is a noun meaning "the phonological or orthographic sound or appearance of a word that can be used to describe or identify something". It carries 2 recorded senses.
linguistics
a piece of stored information that is used to identify an item in an information storage and retrieval system
computer science
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for descriptor come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.