Which term is used to describe water that is safe for drinking?

The term that describes water that is safe for drinking is "potable." This term specifically refers to water that meets safety standards for consumption, ensuring that it is free from harmful contaminants and pathogens that could pose health risks. In other words, potable water is fit for human consumption and is essential for public health.

The other terms have different meanings that do not specifically relate to drinking safety. "Palatable" refers to the taste and acceptability of water; while water can be palatable, it doesn't necessarily mean it is safe to drink. "Colorless" describes a physical characteristic of water but does not indicate its safety for consumption. "Clean" can be misleading because it is a more general term that can refer to the absence of visible contaminants but doesn’t guarantee that the water is safe to drink in terms of chemical or biological safety. Thus, "potable" is the correct choice as it conveys a clear and specific meaning regarding the safety of drinking water.