Velum
1.
(
ἱστίον). A sail, especially the large square mainsail,
as distinguished from the foresail (
dolon) and the topsail (
supparum). (See
Navis.)
2.
(
παραπέτασμα). A curtain hung before the door of a house
like a modern portière-curtain. The name is also applied to any other curtain, as
a window-curtain or the curtain at a theatre. See
Theatrum.