cubit

/ˈkjuːbɪt/
noun
  1. An ancient unit of length based on the distance from the elbow to the tip of the middle finger, usually about 18 inches (45 centimeters).
    • The carpenter's old manual gave measurements in cubits rather than feet.
    • Ancient Egyptians used the cubit to measure land and build pyramids.
    • The Bible describes Noah's ark as 300 cubits long.
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