Plastron and Vellum

Plastron noun - A metal breastplate that was worn under a coat of mail.

Vellum and plastron are semantically related. In some cases you can use "Vellum" instead a noun "Plastron".

Vellum noun - Fine parchment prepared from the skin of a young animal e.g. a calf or lamb.

Plastron and vellum are semantically related. Sometimes you can use "Plastron" instead a noun "Vellum".