Definify.com
Webster 1913 Edition
Vesica
‖
Ve-si′ca
,Noun.
[L.]
A bladder.
Vesica piscis
. [L., fish bladder.]
(Eccl. Art)
A glory, or aureole, of oval shape, or composed of two arcs of circles usually represented as surrounding a divine personage. More rarely, an oval composed of two arcs not representing a glory; a solid oval, etc.