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From The Collaborative International Dictionary of English v.0.48:
Vesica \Ve*si"ca\, n. [L.] A bladder. [1913 Webster] 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. [1913 Webster]