turncap

English

Alternative forms

Noun

turncap (plural turncaps)

  1. A sort of chimney cap which turns round with the wind so as to present its opening to the leeward.
    • 1846, Morrill Wyman, A Practical Treatise on Ventilation:
      a building furnished with cowls, or turncaps, with their vanes so arranged, that, while one shall receive the full force of the wind, the other may allow it to escape freely
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