| English | eng-000 |
| bottom surface | |
| 普通话 | cmn-000 | 低面 |
| 普通话 | cmn-000 | 底面 |
| English | eng-000 | back surface |
| English | eng-000 | basal face |
| English | eng-000 | base plate |
| English | eng-000 | base surface |
| English | eng-000 | lower plane |
| English | eng-000 | soffit |
| English | eng-000 | sole |
| English | eng-000 | subface |
| русский | rus-000 | зона контакта фундамент-основание |