Meaning: This sentence describes a cloud that is floating in the sky and is white in color.
Choice of Words: "Cloud" is a visible mass of water droplets or ice crystals suspended in the atmosphere. "Floats" means to move or stay in the air without falling. "White" means having the color of snow or milk. So "A cloud floats white" means the cloud is moving or staying in the air without falling and is white in color.