Dr. Michaela 'Mike' Quinn: You know what Sam said? She said that seeing us together is like watching a fire burn.
Byron Sully: Is that good?
Dr. Michaela 'Mike' Quinn: Well, ignore a fire and it burns out. But if you tend to it, take care of it, feed it... it keeps growing bigger - burns brighter.
Byron Sully: I'll be your family.
Dr. Michaela 'Mike' Quinn: And I'll be your best friend.
Answer: A Cooper was someone who made various things out of wood including wooden caskets and even barrels.