a can tha

[Gr. ἄκανθα ( a kantha ) = a spine or thorn: ἀκή ( ake ) = a point or edge.] L. In Composition: 1. Bot. A thorn. 2. Zoology: The spine of a fish, of a sea urchin, . II. As a distinct word: Anat.: The spina dors i = the hard posterior protuberances of the spine of the back.