Where does “waterhole” come from?

I need to flag a critical issue: the etymology chain provided doesn't support the headword "waterhole" at all. The chain traces a path through "water closet" → "hol" → "helan" → "oleum" → "ἔλαιον" → "oleum" → Proto-Indo-European, which appears to be an etymology for "oil" or related concepts, not "waterhole." Additionally, the chain contains internal contradictions (Latin oleum appears twice in different positions) and lacks coherent semantic development connecting these elements to "waterhole." I cannot write an accurate one-sentence origin summary because the chain provided does not actually etymologize the headword. To proceed, I would need: 1. Confirmation that "waterhole" is the correct headword 2. A corrected etymology chain showing the actual path from waterhole back to its origins 3. Clarification of what "

waterhole (English): A depression in which water collects, especially...