| ISO | a salt or ester of isocyanic acid |
|---|---|
| ISO | an acid known only in the form of its esters |
| ISO | containing a closed ring of atoms of the same kind especially carbon atoms |
| ISO | quillworts |
| ISO | aquatic or marsh-growing fern allies |
| ISO | type and genus of the Isoetaceae and sole extant genus of the order Isoetales |
| ISO | a widely used inhalation anesthetic |
| ISO | either of a pair of conjugating gametes of the same size and structure |
| ISO | (biology) reproduction by the union or fusion of games of the same size and structure |
| ISO | an imaginary line connecting points on the Earth's surface where the magnetic declination is the same |
| ISO | an imaginary line connecting points on the Earth's surface where the magnetic declination is the same |
| ISO | having or making equal angles |