• Webster's Revised Unabridged Dictionary
    • n Velarium (Zoöl) The marginal membrane of certain medusæ belonging to the Discophora.
    • ***
Century Dictionary and Cyclopedia
    • n velarium An awning which was often drawn over the roofless Roman theaters and amphitheaters to protect the spectators from rain or the sun. Also velum.
    • n velarium [NL.] In zoology, the marginal membrane of certain hydrozoans; the velum. See velum, 4.
    • ***
Chambers's Twentieth Century Dictionary
    • n Velarium vē-lā′ri-um an awning which could be drawn over the Roman amphitheatre: the marginal membrane of certain hydrozoans
    • ***


Webster's Revised Unabridged Dictionary
L., a covering


In literature:

A gigantic purple velarium gave shelter from the rays of the sun.
"Quo Vadis" by Henryk Sienkiewicz
This velarium was an awning that was stretched above the heads of the spectators to protect them from the sun.
"The Wonders of Pompeii" by Marc Monnier