| 单词 | menaquinone | 
| 释义 | Word Frequency menaquinone(ˌmɛnəkwɪˈnəʊn) noun a form of vitaminKsynthesized by bacteria in the intestine or in putrefying organic matter   Also: vitamin K2 Word origin C20: from me(thyl)-na(phtho)quinone | 
	
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