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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.
technical-grade is an adjective meaning "containing small amounts of other chemicals, hence slightly impure". It carries one recorded sense.
containing small amounts of other chemicals, hence slightly impure
“technical-grade sulfuric acid”
chemistry
Definitions, synonyms and semantic relations for technical-grade come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.