opera hat
noun
1.
a man's tall, collapsible top hat, held open or in shape by springs and usually covered with a black, silky fabric.
Also called
gibus
.
Compare
beaver
1
(def 4),
silk hat
,
top hat
.
Origin
1800-10
British Dictionary definitions for
opera hat
opera hat
noun
1.
a collapsible top hat operated by a spring
Also called
gibus