So, this challenge ended up being harder than I expected it to be. I apologize for that. There was a winner, though. My own clever aunt Quilly came up with the right answer last night.

Adjuvant

Ad·ju·vant n.
1) A pharmacological agent added to a drug to increase or aid its effect.
2) An immunological agent that increases the antigenic response.

Now wasn’t that fun? lol Or not. I do have an idea for a more fun challenge, though, that I’ll post shortly. It’s actually an idea my clever brother-in-law came up with and I added to. So, congratulations auntie!