Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
prescriptive is an adjective meaning "pertaining to giving directives or rules". It carries one recorded sense.
pertaining to giving directives or rules
“prescriptive grammar is concerned with norms of or rules for correct usage”
grammar
Definitions, synonyms and semantic relations for prescriptive come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.