| sand dollar n. 1. Any of various thin circular echinoderms of the class Echinoidea, 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 slotlike holes. |
sand dollar
n
(Life Sciences & Allied Applications / Animals) any of various flattened disclike echinoderms of the order Clypeasteroida, of shallow North American coastal waters: class Echinoidea (sea urchins)
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  sand dollar - flattened disklike sea urchins that live on sandy bottomssea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells Exocycloida, order Exocycloida - flat sea urchins |
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