| 单词 | pentad |
| 释义 | Word Frequency pentad(ˈpɛntæd) noun 1. a group or series of five 2. the number or sum of five 3. a period of five years 4. chemistry a pentavalent element, atom, or radical 5. meteorology a period of five days Word origin C17: from Greek pentas group of five |
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英语词典包含233703条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。