| autotroph | autotroph |
| Autotrophie | autotrophy |
| auxotroph | auxotrophic |
| Autograph | autograph |
| Autocross | autocross |
| Autodrom | motor-racing circuit dodgems track bumper car dodgem |
| Autostopp | hitch-hiking autostop |
| automorph | automorphic idiomorphic |
| zytotrop | cytotropic |
| Allotrop | allotrope |
| allotrop | allotropic |
| neurotroph | neurotrophic |
| Azeotrop | azeotrope |
| azeotrop | azeotropic |
| Apostroph | apostrophe |
| Autoblock | autoblock |
| Autochrom | autochrome |
| Autoerotik | autoerotism |
| Autogiro | autogyro autogiro |
| Autograf | autograph |