A material that heat moves through quickly. (9)

The answer to your question is "Conductor". A conductor is a material through which heat can move quickly. The steps to arrive at this answer are as follows:

1. Understand the question: The question is asking for a 9-letter word that describes a material through which heat can move quickly.

2. Analyze the question: Heat transfer occurs in three ways - conduction, convection, and radiation. In this case, we are looking for a material that allows for conduction, which is the process of heat transfer through direct contact.

3. Identify potential answers: The term for a material that allows for heat conduction is a "conductor".

4. Verify the answer: "Conductor" is a 9-letter word, which fits the requirement in the question.

Therefore, the answer is "Conductor".