| Subject | English | Catalan |
| environ. | structure-activity relationship The association between a chemical structure and carcinogenicity | relació estructura-activitat |
| environ. | structure-borne noise Sound that travels over at least part of its path by means of the vibration of a solid structure | soroll induït |
| environ. | structure plan Metropolitan structure and land use plan intended to outline the general lines along which development should proceed in an area | pla estructural |