基jī 1.基础{base; foundation}: 房～{foundation of a house}|地～{foundation}|路～。{roadbed} 2.起头的;根本的{primary; fundamental}: ～层{grass roots}|～数。{base number} 3.化合物分子中所含的一部分原子,被看做是一个单位时叫做基,如羟基、氨基。{radical; element or atom, or a group of these forming part of a compound, such as hydroxyl and amino}