descriptor

[dih-skrip-ter]

noun

a significant word or phrase used to categorize or describe text or other material, especially when indexing or in an information retrieval system.
Computers. a data item that stores the attributes of some other datum: a task descriptor.

Origin of descriptor

1930–35, for an earlier sense; describe + -tor, with vowel change and devoicing by analogy with similar L derivatives
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019