adjective
relating to the surface or end opposite to the mouth in certain animals, such as starfish
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The abactinal surface of a starfish is covered in small spines.
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The top side of a starfish, known as the abactinal surface, has a rough texture.
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I accidentally touched the abactinal part of the starfish and it felt weird.
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She always preferred to stay on the abactinal side of the argument, avoiding any confrontations.