Why Is It Called Layman's Terms?

Etymology. The term derives from the 16th-century idiom "in plain English", meaning "in clear, straightforward language". Another name for the term, layman's terms, is derived from the idiom "in layman's terms" which refers to language phrased simply enough that a layperson, or common person, can understand.

Who is a layman what do we call a person who is not a layman?

The person who is not a layman can be called as a clergyman.

Is layman a real word?

noun, plural lay·men. a person who is not a member of the clergy; one of the laity. a person who is not a member of a given profession, as law or medicine.