velaria

/V EH0 L AA1 R IY0 AH0/
noun
  1. 1

    The marginal membrane of certain medusae belonging to the Discophora

  2. 2

    An awning that stretched over the seating area of the Colosseum in Ancient Rome

Source: https://en.wiktionary.org/wiki/velaria, https://en.wiktionary.org/wiki/velarium