vēlārĭum, ii, n. [velum],
a covering , screen , awning , stretched above the theatre to keep off the sun, Juv. 4, 122.
vēlārium ī, n velum.—In a theatre, an awning, screen (to protect spectators from the sun), Iu. ...
An Elementary Latin Dictionary
·noun The marginal membrane of certain medusae belonging to the Discophora. ...
Webster's Dictionary of the English Language