It's likely a more casual or informal way of referring to water (H₂O).

Here's why:

* Hydrogen is a component of water.

* Oxide refers to a compound containing oxygen.

Therefore, "hydrogenous oxide" could be interpreted as a compound containing hydrogen and oxygen, which describes water.

However, it's important to note that using "hydrogenous oxide" is not a common or preferred way to refer to water in scientific contexts. It's always more accurate and clear to use the standard chemical name "water" or its formula "H₂O."