A more thorough explanation:

Adminicle is a word that means proof that supports or explains something. It can also refer to a document that helps prove the existence or terms of another document that is not available.

• When the detective found the adminicle, it helped him solve the case.
• The adminicle was a letter from the suspect's friend that confirmed his alibi.
• In Scottish law, an adminicle can be used to prove the terms of a lost will or deed.

The first two examples show how an adminicle can be used as proof to support a claim or solve a problem. The third example shows how an adminicle can be used in a specific legal context to prove the terms of a lost document.