巴西钳蝎：叮咬可致严重中毒甚至死亡的一种毒蝎- opisthion
- opisthionasial
- opistho-
- opisthocranion
- opisthogenia
- 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