多氮化合物：含两个或更多氮原子的有机化合物- Haenel's symptom
- Haeser
- Haff disease
- Hafnia
- hafnium
- Hagedorn needle
- Haglund's disease
- Hagner's bag
- hahnemannian
- hahnemannism
- hahnium
- HAI
- Haidinger's brushes
- Haines' formula(coefficient),reagent,test
- hair
- hairball
- haircap
- haircast
- halation
- halazepam
- halazone
- halcinonide
- Haldane chamber (apparatus)
- Haldol
- Haldrone