• (astronomy) The axis of a projected conical shadow; the direction of the force of gravity at a location; down.

    "The nadir of the sun is the axis of the shadow projected by the Earth."

  • (figuratively) The lowest point; time of greatest depression.
  • The point of the celestial sphere, directly opposite the zenith; inferior pole of the horizon; point of the celestial sphere directly under the place where we stand.
  • (beekeeping, archaic) An empty box added beneath a full one in a beehive to give the colony more room to expand or store honey.


  • (transitive, beekeeping) To extend (a beehive) by adding an empty box at the base.

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