| Word | Definitions | Synonyms |
|---|---|---|
| isoseismal | (noun) a line on a map connecting points at which earthquake shocks are of equal intensity. | - |
| isosorbide | (noun) drug (trade name Isordil) used to treat angina pectoris and congestive heart failure | Synonyms: Isordil |
| isostasy | (noun) (geology) a general equilibrium of the forces tending to elevate or depress the earth's crust | - |
| isosyllabism | (noun) (linguistics, poetry) the use of isosyllabic verse. | - |