A more thorough explanation:

Definition: An admanuensis (ad-man-yoo-en-sis) is a person who takes an oath by placing their hand on the Bible.

Example: In court, witnesses are often asked to swear an oath by placing their hand on the Bible and promising to tell the truth.

Explanation: The example illustrates how an admanuensis is used in a legal setting. When someone takes an oath, they are making a solemn promise to tell the truth. By placing their hand on the Bible, they are showing that they take this promise seriously and are willing to be held accountable if they break it.