Backdraught
noun
a reverse movement of air, gas, or liquid
an explosion that occurs when air reaches a fire that has used up all the available oxygen, often occurring when a door is opened to the room containing the fire
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material used for refilling an excavation. to refill (an excavation). historical examples these also were temporarily useless, because there had been no dredging in front of them, or backfilling in their rear. the philippines past and present (volume 2 of 2) dean conant worcester verb (transitive) to refill an excavated trench, esp (in archaeology) at […]
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background extinction background extinction (bāk’ground’) the ongoing extinction of individual species due to environmental or ecological factors such as climate change, disease, loss of habitat, or compet-tive disadvantage in relation to other species. background extinction occurs at a fairly steady rate over geological time and is the result of normal evolutionary processes, with only a […]