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plural isises
(zoology) Any coral of the genus Isis, or family Isididae, composed of joints of white, stony coral, alternating with flexible, horny joints. quotations
[…] the numerous families of coral, which, under the form of tubular, starry, or stony stems, are denominated tubipores, madrepores, and isises.
1834, John Mason Good, The Book of Nature