蜱总科：为蜱亚目(Ixodides)的总科，包括软蜱科(Argasidae)与硬蜱科(Ixodidae)- isotopology
- isotoxic
- isotoxin
- isotransplant
- isotransplantation
- isotretinoin
- Isotricha
- isotrimorphism
- isotrimorphous
- isotron
- isotropic
- isotropy
- isotype
- isotypic
- isouretin
- isovaleric acid
- isovaleric acid CoA dehydrogenase deficiency
- isovaleryl CoA dehydogenase
- isoxepac
- isoxicam
- isoxsuprine hydrochloride
- isozyme
- issue
- IST
- isthmectomy