di-
pref 前缀
1 (with ns 後与名词结合) two; double 二; 双; 二重; 二倍: dicotyledon.
2 (chemistry 化) (with ns in names of chemical compounds 後与名词结合构成化合物名称) containing two atoms or groups of the specified type 含有两个原子的; 含有两组某一类型物质的: dioxide
dichromate. Cf 参看 bi-, tri-.