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