VELARIUM

Etymology

Noun

velarium (plural velaria or velariums)

(zoology) The marginal membrane of certain medusae belonging to the Discophora

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

Source: Wiktionary

Ve*la"ri*um, n.; pl. Velaria. Etym: [L., a covering.] (Zoöl.)

Definition: The marginal membrane of certain medusæ belonging to the Discophora.

Source: Webster’s Unabridged Dictionary 1913 Edition