Definition of unburned in US English:


(also unburnt)


  • 1Not damaged or destroyed by fire.

    • ‘Data were collected from red maple, chestnut oak, and scarlet oak seedlings on the burned site and an unburned reference site.’
    • ‘He has been having skin grafts from unburnt skin on his abdomen.’
    • ‘Among other things they met with several curiously formed graves containing urns with burned and unburned bones.’
    • ‘Adjacent to this is an area of unburnt hillside, which has experienced extensive invasion of lantana and other non-native weeds.’
    • ‘We also described deterioration of each snag using five characteristics based on a modified version of the wildlife tree classification normally used for unburned trees.’
    • ‘Skin grafts from unburned parts of the patient can be meshed and made to cover three times the original area.’
    • ‘In 10 to 14 days, the unburned site will have healed and he can cull it again for more grafts.’
    • ‘So far, Jordan has used unburned skin on three patients to perform grafts on their hands.’
    • ‘Small patches of habitat remained completely unburned within treatment units.’
    • ‘These transects extended down a broad slope into the burn from a mixed stand of unburned spruce and birch on a ridgetop at one edge of the burn.’
    • ‘It was a fragment of paper that remained unburnt.’
    • ‘This high-intensity crown fire killed almost all trees in the area, leaving only small patches of unburned forest.’
    • ‘The hotel was totally destroyed, hardly a fragment of woodwork in the entire building remaining unburned.’
    • ‘He salvaged the unburned part of the rice and put it into a bowl.’
    • ‘Even so, the unburned sites generally had simpler communities with more common species.’
    • ‘The groups are contaminated by only a few fragments of unburned bone, which clearly differ from the burned material in terms of their anatomical and/or taxonomic character.’
    • ‘According to various accounts, 5 to 7 houses remained unburned.’
    • ‘The 1996 burn was performed to reduce thatch levels, and hopefully improve germination rates of experimentally added seeds above the low levels expected in an unburned field.’
    • ‘His unburnt dorsal portion allows him to lie on his back, with almost the entire body saving the head dressed to prevent exposure to infection.’
    • ‘An unburned, circular, wall-post sweat lodge was also present at this site.’
    1. 1.1 (of energy sources) not used or consumed.
      ‘unburned calories’
      • ‘Two-stroke engines are calibrated to run rich for smooth engine response, resulting in high emissions of carbon monoxide (CO) and unburned hydrocarbon (HC).’
      • ‘The use of biodiesel in a conventional diesel engine results in substantial reduction of unburned hydrocarbons, carbon monoxide and particulate matter when compared to emissions from diesel fuel.’
      • ‘Biodiesel reduces emissions such as carbon monoxide, unburned hydrocarbons and particulate matter.’
      • ‘Fire was an important tool during European settlement, and many catastrophic fires occurred due to the build up of unburned fuels in the form of slash generated from land clearing.’
      • ‘Thus, the fuel supplied to the engine is ignited without fail, and unburned gas release to the atmosphere is surely prevented.’
      • ‘Other pollutants that can be produced by some appliances are unburned hydrocarbons and aldehydes.’
      • ‘Bio-diesel fuelled engines, like their regular fuel counterparts, still emit carbon monoxide, unburned hydrocarbons, carbon dioxide and particulate matter.’
      • ‘The problem is not so much the 5,000-pound satellite, but the 1,000 pound of unburned fuel which could cover 200 yards.’
      • ‘Emissions of particulate matter, oxides of nitrogen and, to a lesser extent, unburned hydrocarbons, have remained challenges for diesel developers.’
      • ‘These two-stroke engines, by current design, emit 20 to 33 percent of their fuel unburned.’
      • ‘After motoring the engine to clear unburned fuel from the engine, and waiting the prescribed time for starter limitations, a restart of engine #5 was attempted.’
      • ‘Catalysts minimize emissions of carbon monoxide and unburned hydrocarbons.’
      • ‘That's a lot of unburned calories.’
      • ‘About 25 to 30 percent of unburned fuel was being ejected into the waterways.’
      • ‘Nitrogen oxides, carbon monoxide, and unburned hydrocarbons are the main exhaust pollutants and they are involved in the production of damaging photochemical smog.’
      • ‘Research suggests that unburnt rocket fuel from space launches could contribute to a rise in various diseases in nearby populations.’
      • ‘The catalytic converter transforms carbon monoxide and unburned fuel into water and carbon dioxide and also reduces oxides of nitrogen to molecular nitrogen gas.’
      • ‘Ozone, a major component of urban smog, is formed by unburned fuel reacting with other compounds in the atmosphere.’
      • ‘The engine can achieve maximum rate acceleration under load without spewing clouds of black smoke (unburned fuel) from the exhaust.’
      • ‘Catalytic Converters are usually stainless steel containers and tubing which provide an environment for chemical reactions where unburned hydrocarbons combust, using platinum and rhodium as catalysts.’
    2. 1.2 (especially of bricks) not exposed to heat in a kiln.
      • ‘The extensive use of the unburned brick is necessitated by the difficulty of obtaining fuel, and various methods are adopted to reduce the number of burned brick required in construction.’
      • ‘Buildings were made with hewn stone (until then only unburnt bricks were used)’