* Basic Definition: "Potable water" is simply water that is safe to drink. This meaning is generally understood by most people who use the English language.
* Specificity: Dictionaries often focus on providing definitions for words with less common meanings or more complex concepts. "Potable water" is a relatively simple term with a widely accepted understanding.
* Redundancy: Defining "potable water" as "water safe for drinking" might feel redundant, as the term "potable" itself implies drinkability.
* Focus on Other Meanings: Dictionaries often define "potable" in relation to its other uses, such as "capable of being drunk" or "suitable for drinking."
While dictionaries may not explicitly define "potable water" as a separate entry, they often include explanations of "potable" or "potability" that make the meaning clear.
Ultimately, the inclusion or exclusion of specific definitions in a dictionary depends on factors like the dictionary's scope, target audience, and the perceived necessity of defining a term that is already widely understood.