Denshi Jisho — Online Japanese dictionary

こうそ enzyme
Common word, Noun, No-adjective 
こうぼ yeast; leaven
Common word, Noun 
素学 こうそがく enzymology
Noun 
母菌 こうぼきん yeast fungus
Noun 
母亜鉛 こうぼあえん zinc yeast; zinc-enriched yeast
Noun 
素的褐変 こうそてきかっぺん enzymatic browning
Noun 

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