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| Terms for subject Environment (5949 entries) |
| organochlorine compound (Organic compounds containing a C-Cl bond) | konposatu organokloratu | |
| organohalogen compound (Organic compounds containing a C-halogen bond) | konposatu organohalogenatu | |
| organoleptic property (Properties that can be perceived by sense organs) | propietate organoleptiko | |
| organometallic compound (Molecules containing carbon-metal linkage; a compound containing an alkyl or aryl radical bonded to a metal) | konposatu organometaliko | |
| organonitrogen compound (Organic compounds having a C-N bond) | konposatu organonitrogenatu | |
| organooxygen compound (Compounds, both aliphatic and aromatic, which have a C-O bond, including alcohols, aldehydes, etc.) | konposatu organiko oxigenatu | |
| organophosphorous compound (Pesticides that contain phosphorous; short-lived, but some can be toxic when first applied) | konposatu organofosforatu | |
| organosilicon compound (Any natural substance composed of two or more unlike atoms held together by chemical bonds and containing silicon, a non-metallic element often found in rocks or minerals) | konposatu organosiliziko | |
| organosulphur compound (One of a group of substances which contain both carbon and sulfur) | konposatu organosulfuratu | |
| organotin compound (Chemical compounds used in anti-foulant paints to protect the hulls of boats and ships, buoys and pilings from marine organisms such as barnacles) | eztainuaren konposatu organiko | |
| ornithology (The branch of zoology that deals with the study of birds, including their physiology, classification, ecology, and behaviour) | ornitologia | |
| orography (A rarely used word referring to the study of mountain systems and the depiction of their relief) | orografia | |
| orthopteran (A heterogeneous order of generalized insects with gradual metamorphosis, chewing mouthparts, and four wings) | ortopteroak | |
| osmosis (The passage of a solvent through a semipermeable membrane separating two solutions of different concentrations. A semipermeable membrane is one through which the molecules of a solvent can pass but the molecules of most solutes cannot. There is a thermodynamic tendency for solutions separated by such a membrane to become equal in concentration, the water (or other solvent) flowing from the weaker to the stronger solution. Osmosis will stop when the two solutions reach equal concentration, and can also be stopped by applying a pressure to the liquid on the stronger-solution side of the membrane. The pressure required to stop the flow from a pure solvent into a solution is a characteristic of the solution, and is called the osmotic pressure. Osmotic pressure depends only on the concentration of particles in the solution, not on their nature) | osmosi | |
| outer space (allocation plan, Area out of closed settlements or building, area out of closed settlements or building) | kanpoalde | |
| outer space (allocation plan, Area out of closed settlements or building, area out of closed settlements or building) | inguru | |
| oven (An enclosed heated compartment usually lined with a refractory material used for drying substances, firing ceramics, heat-treating, etc.) | labe | |
| overburden (The material such as soil and rock lying above a mineral deposit that must be removed in order to work the deposit) | gehiegizko karga | |
| overcrowding (An excess of people gathered together in a confined space) | jende-pilatze | |
| overcrowding (An excess of people gathered together in a confined space) | jende-metatze |