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Definition of Sand dollar
1. Noun. Flattened disklike sea urchins that live on sandy bottoms.
Definition of Sand dollar
1. Noun. An echinoderm, of the order ''Clypeastroida'', that has a flat, disk-shaped body with the mouth in a mid-ventral position, and lives in sand, on or near the surface ¹
¹ Source: wiktionary.com