| A | B |
| aut,auth,auto | self-propelled, for oneself |
| bi,bin,bis | two; twice; double |
| bio, bi, bous | life; living |
| autopsy | "seeing with one's own eyes" the cause of death |
| author | original writer |
| autobiography | account of one's life written by himself |
| automobile | self propelled vehicle |
| biannual | taking place twice a year |
| biennial | taking place every two years |
| bicameral | made up of two chambers |
| bicentennial | 200 years |
| bifocals | allows both distant and close views |
| bigamy | marrying two women |
| bilingual | speaking two languages |
| biped | two-footed animal |
| bisect | to cut or divide into two parts |
| bipod | a two-legged support, as used to support machine guns |
| biscuit | cooked twice |
| binocular | pertaining to two eyes; as, field glasses |
| biopsy | examination of living tissue |
| biography | account of one's life written by someone else |
| biology | science or study of life or living organisms |
| amphibious | both land and water animal |
| biweekly | two times a week or once in two weeks |
| bilateral | two sides |
| antibiotic | against life |
| microbiology | study of very minute (small) life |