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louver noun

  /ˈluːvə/ , /ˈluːvɚ/
  • A type of turret on the roof of certain medieval buildings designed to allow ventilation or the admission of light. [from 14th c.]
  • (chiefly, _, in plural) A series of sloping overlapping slats or boards which admit air and light but exclude rain etc. [from 16th c.]
  • Any of a system of slits, as in the hood of an automobile, for ventilation.
 feritoia
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