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今天是:

nonagon


  • 英式英标[\'nɑnəɡɑn]
  • 美式音标[\'nɒnəg(ə)n]

n. [数] 九边形

英文词源

nonagon (n.)
"plane figure with nine sides," 1680s, a hybrid from Latin nonus "ninth" (see nones) + ending from pentagon, etc.