单词 | sand dollar |
释义 | sand dollar n. 1. Any of various thin circular echinoderms of the order Clypeasteroida, especially Echinarachnius parma, of coastal northern Atlantic and Pacific waters, having a covering of short movable spines. 2. The disklike internal skeleton of a sand dollar, having five radially symmetric oblong markings and often a pattern of long narrow holes. ![]() Clypeaster subdepressus |
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