What does the word cistem mean?

The word "cistem" doesn't appear to have a standard meaning in English. It's likely a misspelling or a word from a specific context.

Here are some possibilities:

* Misspelling: Perhaps you meant "cistern," which refers to a tank used for storing water.

* Technical term: "Cistem" might be a technical term in a specific field like medicine or engineering. To understand its meaning, you'd need more context.

* Made-up word: It's possible the word is made up or used in a fictional setting.

To help me figure out what you're looking for, please provide more information:

* What was the context where you saw "cistem"? (A book, a website, a conversation, etc.)

* What was the topic being discussed?

With more information, I can help you understand the meaning of "cistem."