Underlying
The underlying asset, or underlyer, or underlier, or reference asset — call it what you will — is that thing of which your derivative is derivative. Not to be confused with the undying, of course, and certainly not after sun-down.
The underlying asset, or underlyer, or underlier, or reference asset — call it what you will — is that thing of which your derivative is derivative. Not to be confused with the undying, of course, and certainly not after sun-down.