D defs.my
Entry 1 sense Webster, 1913

Water barometer

/wôt'-ẽr bẽr-äm'-ĭt-ẽr/ · Wa·ter ba·rom·e·ter · IPA
01 A barometer in which the changes of atmospheric pressure are indicated by the motion of a column of water instead of mercury. It requires a…
  1. 1.
    A barometer in which the changes of atmospheric pressure are indicated by the motion of a column of water instead of mercury. It requires a column of water about thirty-three feet in height.(Physics)