1. a house or dwelling built on a floating platform or pontoons, typically anchored in water
Usage: also called a houseboat when mobile; common in coastal and riverside communities

Examples

• The floathouse was anchored securely in the marina.
• She bought a floathouse to live on the river year-round.
• The floathouse community had its own dock and utilities.
• During the flood, the floathouse rose with the water level.
• Many floathouses in the Pacific Northwest are permanent residences.