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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
prn is an adverb meaning "according to need (physicians use PRN in writing prescriptions)". It carries one recorded sense.
according to need (physicians use PRN in writing prescriptions)
“add water as needed”
Definitions, synonyms and semantic relations for prn come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.