Aquifer

I recently used the word "aquifer" in a conversation. The person with whom I was speaking stopped me mid-sentence and accused me of making up a word. I was honestly puzzled, so much so that I had absolutely no idea about which word I was being accused of creating.

Aquifer.

Be honest, please. Consider this a scientific study. Do you know what aquifer means, and if not then do you think I'm an asshole for using it in polite discourse?