#floater  an object that floats or is capable of floating
  supertype:  #physical_object__object  a tangible and visible entity; an entity that can cast a shadow; "it was full of rackets, balls and other objects"
  subtype:  #iceberg__berg  a large mass of ice floating at sea; usually broken off of a polar glacier
     subtype:  #growler  a small iceberg or ice floe just large enough to be hazardous for shipping

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