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(used in units of measurement) denoting a factor of 10¹⁵ (one thousand million million)
From pe(n)ta- (see penta-), based on the supposed analogy of tera- and tetra-.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。