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单词 raphide
释义

Collins Concise English Dictionary © HarperCollins Publishers::
raphide /ˈreɪfaɪd/, raphis /ˈreɪfɪs/ n ( pl raphides /ˈræfɪˌdiːz/)
  1. any of numerous needle-shaped crystals, usually of calcium oxalate, that occur in many plant cells as a metabolic product
Etymology: 18th Century: from French, from Greek rhaphis needle
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