英文字典中文字典51ZiDian.com
|
heptad n. 七个,七个成套之物,七价原子 七个,七个成套之物,七价原子 heptad n 1: the cardinal number that is the sum of six and one [synonym: {seven}, {7}, {VII}, {sevener}, {heptad}, {septet}, {septenary}] Heptad \Hep"tad\, n. [L. heptas the number seven. Gr. ?, ?, fr.
"epta` seven.] (Chem.) An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective. [1913 Webster]
请选择你想看的字典辞典:
|
安装中文字典英文字典查询工具!
英文字典中文字典相关资料:
|
中文字典-英文字典 2005-2009