夹竹桃：地中海及亚洲含夹竹桃麻素的常青灌木。N. odorum 为香味夹竹桃，N. oleanderL.为普通夹竹桃- haustorium
- haustra
- haustral
- haustration
- haustrum
- haut-mal
- HAV
- Haverhill fever
- Haverhillia multiformis
- haversian canal (space), glands, lamella, system
- hawkinsin
- hawkinsinuria
- Hawley retainer (appliance)
- Hayem's corpuscles, encephalitis, icterus (jaundice), solution
- Hayem-Widal syndrome
- hay fever
- Haygarth's nodes (nodosities)
- Hay's test
- Hazen's theorem
- Hb
- HB
- HBr
- HBV
- H. C.
- HCG.hCG