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In the Classical latin, volvulus is a derivative with a diminutive suffix ("ul") of the volvus (bulbus) means "bulb".
In the word volvula we can also find the diminutive suffix "ul" therefore volvula derived from volva (vulva, bulba) means caul, tegument, womb, uterus etc. Whereas it is a noun it cannot be a specific attributive because it must put either in genitive case or form an adjective from it. As far as I know it is a valid homonym even if incorrect gramatically because this is the first naming of the species.