high-grade
adjective/ˌhaɪ ˈɡreɪd/
/ˌhaɪ ˈɡreɪd/
[usually before noun]- of very good quality
- high-grade petrol
Oxford Collocations DictionaryHigh-grade is used with these nouns:- ore
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high-grade
Definition of high-grade adjective from the Oxford Advanced Learner's Dictionary