Peribolaion denotes something worn or given as a covering, seen with hair and with clothing that can be rolled up.

The two verses show a covering in two concrete settings: hair is described as given for this purpose in 1 Corinthians 11:15, while Hebrews 1:12 places it in imagery of clothing being rolled up and changed.

1. Covering associated with hair · dominant

   In 1 Corinthians 11:15, the genitive singular neuter form occurs in the statement that a woman's long hair has been given to her; the APB renders the clause "her hair has been given to her for a covering."

   1 Corinthians 11:15
2. Garment-like covering that is rolled up · occasional

   In Hebrews 1:12, the accusative singular neuter form occurs in imagery of items being rolled up and changed; the APB renders, "And like a cloak you will roll them up, like clothing, and they will be changed."

   Hebrews 1:12

In the Anselm Project Bible: The APB explicitly uses "covering" in 1 Corinthians 11:15. In Hebrews 1:12 it presents clothing and a "cloak" being rolled up, so its precise English equivalent for the term cannot be isolated.