vellum, velum

Vellum or vellum means

Velum or velum means

Now that you know that, you can say --

vellum, velum

Vellum or vellum means the skin of an animal, most commonly a calf , a sheep or a goat, treated and used to write on --
Modern diplomas are printed on artificial vellum.
Many ancient books were written on vellum.

Velum or velum means the soft palate, or another sheer membrane making a partition, such as a cloud --
He burned his velum with hot food; he should recover in a few weeks.
Look at the velum; it seems to be draped between the large round clouds behind it.

Now that you know that, you can say --
"We found some old illustrations done in ink on vellum, including a drawing of the velum, tongue, and teeth."