臭虫科：异翅亚目(Hetero-ptera)无翼、吸血昆虫，包括臭虫及有关虫类，医学上重要的有臭虫属(Cimex)、鸡臭虫属(Haematosi-phon)、细臭虫属(Leptocimes)及燕虱属(Oeciacus)- 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
- Hales' piesimeter
- half-life
- half-time
- half-value
- halfway house