D defs.my
Entry 3 senses Webster, 1913

Floater

/flōt'-ẽr/ · Float·er · IPA /ˈfloʊtəɹ/
01 n. One who floats or swims.
  1. 1.
    One who floats or swims.
  2. 2.
    A float for indicating the height of a liquid surface.
  3. 3.
    A voter who shifts from party to party, esp. one whose vote is purchasable.(Politics) [U. S.]