- The C clef positioned to indicate that the third line from the bottom of a staff represents the pitch of middle C.中音谱表：中音谱号C，其位置表示为五线谱底部起第三条线，代表中音C的音高标准
- antidiarrheal
- antidiuretic hormone
- antidote
- antidoted
- antidotes
- antidoting
- antidumping
- antielectron
- antienzyme
- antiestablishment
- Antietam
- antifebrile
- antifederalist
- antifeminist
- antifertility
- antifluoridationist
- antifluoridationists
- antifouling
- antifouling paint
- antifreeze
- antifreezes
- antifungal
- antigalaxy
- antigen
- antigens