The Collaborative International Dictionary of English v.0.48:

Floe \Floe\ (fl[=o]), n. [Cf. Dan. flag af iis, iisflage, Sw.
   flaga, flake, isflaga, isflake. See Flag a flat stone.]
   A low, flat mass of floating ice.
   [1913 Webster]

   Floe rat (Zool.), a seal (Phoca f[oe]tida).
      [1913 Webster]