牙根间区：指分叉的牙根基部间区- autophobia
- autophonometry
- autophthalmoscope
- autophyte
- autoplasmotherapy
- autoplast
- autoplastic
- autoplasty
- autoploid
- autoploidy
- autopodium
- autopoisonous
- autopolymer
- autopolymerization
- autopolyploid
- autopolyploidy
- autoprecipitin
- autoprotection
- autoproteolysis
- autoprothrombin
- autoprotolysis
- octabenzone
- octacosane
- octacosanol
- octadecanoate