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plural ossicones
Either of the horn-like protuberances on the heads of giraffes and male okapi. Some extinct species in the family bore antler-like ossicones. quotations examples
The Kanapoi Sivatherium has two pairs of ossicones, above the eye and between the ears, and neither is diminutive.
2022, Thomas Halliday, Otherworlds, Penguin, published 2023, page 27