| Subject | English | Latvian |
| environ. | alicyclic hydrocarbon A class of organic compounds containing only carbon and hydrogen atoms joined to form one or more rings and having the properties of both aliphatic and cyclic substances | aliciklisks ogļūdeņradis |
| environ. | aliphatic hydrocarbon Hydrocarbons having an open chain of carbon atoms, whether normal or forked, saturated or unsaturated | alifātisks ogļūdeņradis |
| environ. | aromatic hydrocarbon Hydrocarbons having an unsaturated ring containing alternating double and single bonds, especially containing a benzene ring | aromātiskais ogļūdeņradis |
| environ. | chlorinated hydrocarbon A class of persistent, broad-spectrum insecticides that linger in the environment and accumulate in the food chain. Among them are DDT, aldrin, dieldrin, heptachlor, chlordane, lindane, endrin, mirex, hexachloride, and toxaphene. In insects and other animals these compounds act primarily on the central nervous system. They also become concentrated in the fats of organisms and thus tend to produce fatty infiltration of the heart and fatty degeneration of the liver in vertebrates. In fishes they have the effect of preventing oxygen uptake, causing suffocation. They are also known to slow the rate of photosynthesis in plants. Their danger to the ecosystem resides in their rate stability and the fact that they are broad-spectrum poisons which are very mobile because of their propensity to stick to dust particles and evaporate with water into the atmosphere | hlorēts ogļūdeņradis |
| energ.ind. | Enhanced Hydrocarbon Recovery | ogļūdeņražu slāņa atdeves palielināšana |
| energ.ind. | Enhanced Hydrocarbon Recovery | ogļūdeņražu ieguves paaugstināšana |
| energ.ind. | enhanced recovery of hydrocarbons | ogļūdeņražu ieguves paaugstināšana |
| energ.ind. | enhanced recovery of hydrocarbons | ogļūdeņražu slāņa atdeves palielināšana |
| environ., chem. | fluorinated hydrocarbon | fluorogļūdeņradis |
| environ. | halogenated hydrocarbon One of a group of halogen derivatives of organic hydrogen and carbon containing compounds; the group includes monohalogen compounds (alkyl or aryl halides) and polyhalogen compounds that contain the same or different halogen atoms | halogenēts ogļūdeņradis |
| environ. | hydrocarbon storage tank A container or a reservoir for the storage of hydrocarbons | ogļūdeņraža uzglabāšanas tvertne |
| environ. | polycyclic aromatic hydrocarbon Hydrocarbons containing two or more closed rings of atoms | policiklisks aromātisks ogļūdeņradis |
| environ. | polycyclic hydrocarbon Hydrocarbon molecule with two or more nuclei; examples are naphtalene, with two benzene rings side by side, or diphenyl, with two bond-connected benzene rings. Also known as polynuclear hydrocarbon | policiklisks ogļūdeņradis |
| econ. | storage of hydrocarbons | ogļūdeņražu uzglabāšana |
| gen. | unconventional hydrocarbon | netradicionāls ogļūdeņradis |
| gen. | unconventional hydrocarbon | nekonvencionāls ogļūdeņradis |