Vellum from the French, Parchment from the English.
What matters is what is written. This has not changed.
The five pages of the U.S. Constitution as well as the Declaration of Independence, the Bill of Rights, and the Articles of Confederation are written on parchment.
What will be written on our next major document? That is up to you. What it is written on is irrelevant. Some things never change. Others do.
Have you figured out which is which?
When sports & cheap entertainment no longer hold the attention of the masses, morality and rationality will reign. When the tyranny of government is slewed at the hands of Patriots, designs on liberty will of import be deemed. When political correctness is thrown under the wheels of survival, the truth shall remain the goal of good men.
When someone ask you what Vellum is, you will now know.