A more thorough explanation:

Ingrossator

Ingrossator is a term used in Law Latin that refers to a clerk who writes records or legal documents on parchment. For instance, the Engrosser of the Great Roll was known as the Ingrossator Magni Rotuli.

An example of an ingrossator is a clerk who writes a legal document such as a deed or a will on parchment. Another example is the Engrosser of the Great Roll, who was responsible for writing records on parchment.

These examples illustrate how an ingrossator is a person who writes legal documents on parchment. They show that an ingrossator is an important figure in the legal system who is responsible for creating accurate and official records.