皂树皮：皂树(Quillaja saponaria Molina)树皮干燥的内部；以前用做局部刺激药。其主要成分是皂皮酸，用来制造皂苷，在洗发剂成分中用其发泡特性，在胶片生产中用做去垢剂- opisthognathism
- opisthomastigote
- opisthoporeia
- opisthorchiasis
- Opisthorchis
- opisthorchosis
- opisthotic
- opisthotonoid
- opisthotonos
- opisthotonus
- Opitz's disease
- opium
- opocephalus
- opodidymus
- opodymus
- opossum
- Oppenheim's disease(syndrome),sign (refl-ex)
- opponens
- opportunistic
- oppositipolar
- -opsia
- opsialgia
- opsin
- opsinogen
- opsinogenous