| Terms for subject Environment (7785 entries) |
| ionosphere | йоносфера | |
| iriomote cat | ириoмотова котка | |
| iron | желязо | |
| iron and steel industry | желязо- и стоманодобивна промишленост | |
| iron industry | железодобивна промишленост | |
| iron industry | железодобивна промишленост | |
| iron scrap | железен скрап | |
| ironwork industry (Industry for the production of iron articles) | промишленост за железни предмети | |
| irradiation | ирадиация | |
| irreversibility of the phenomenon (That quality of a process that precludes a prior state from being attained again) | необратимост на явлението | |
| irreversible transformation | необратимо превръщане | |
| irrigation (1. To supply land with water so that crops and plants will grow or grow stronger) | напояване | |
| irrigation canal | напоителен канал | |
| irrigation farming | напоително земеделие | |
| irrigation system | напоителна система | |
| island | остров | |
| island ecosystem (Unique but fragile and vulnerable ecosystems due to the fact that the evolution of their flora and fauna has taken place in relative isolation. Many remote islands have some of the most unique flora in the world; some have species of plants and animals that are not found anywhere else, which have evolved in a specialized way, sheltered from the fierce competition that species face on mainland) | островна екосистема | |
| ISO standard (standard of International Standard Organisation; Documented agreements containing technical specifications or other precise criteria to be used consistently as rules, guidelines, or definitions of characteristics, to ensure that materials, products, processes and services are fit for their purpose) | ISO стандарти | |
| isomer (1. Two or more compounds having the same molecular formula, but a different arrangement of atoms within the molecule. 2. One of two or more chemical substances having the same elementary percentage composition and molecular weight but differing in structure, and therefore in properties; there are many ways in which such structural differences occur) | измер | |
| isotope | изотоп |