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vesica pis·cis(pī′sĭs, pĭs′ĭs)
1. A pointed oval shape formed by the intersection of the circumference of one circle with the center of another circle with an equal radius.
2. See mandorla.
[New Latin vēsīca piscis : Latin vēsīca, bladder + Latin piscis, genitive of piscis, fish (from the resemblance in shape).]