acantha

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a·can·tha

 (ə-kăn′thə)
n. pl. a·can·thae (-thē)
A sharp spiny part or structure, such as the spinous process of a vertebra.

[New Latin, from Greek akantha, thorn.]

acantha

(əˈkænθə)
n
a pointed, projecting structure, such as a thorn or prickle
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.acantha - any sharply pointed projection
projection - any solid convex shape that juts out from something
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Acanthae of various sizes and shapes were present with the greatest variation in size on the largest lobe where relatively large placoid-like acanthae were observed.