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Air-tight

a.
  1. So tight as to be impermeable to air or other gases; as, an air-tight cylinder; -- said of containers.
  2. of such close construction as to have little leakage of air in or out; -- said of structures
  3. so thoroughly convincing as to be insusceptible to doubt; having no apparent counterarguments; -- of arguments or assertions

n.
  1. A stove the draft of which can be almost entirely shut off.