无麸质 (wú fūzhì — 'gluten-free') is the standard label phrasing on Chinese food packaging. The term spread in mainland Chinese with the imported Western awareness of celiac disease and gluten intolerance.
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麸 (fū) literally means 'wheat bran' — the husk of wheat. So 麸质 is 'the substance of wheat,' a clean calque of the Latin-derived English 'gluten' (from glutinous, sticky).
