exocycloida
English Thesaurus
1. flat sea urchins (noun.animal)
| hypernym | : | animal order, |
| definition | : | the order of animals (noun.animal) |
| member holonym | : | sand dollar, |
| definition | : | flattened disklike sea urchins that live on sandy bottoms (noun.animal) |
| member meronym | : | class echinoidea, echinoidea, |
| definition | : | sea urchins and sand dollars (noun.animal) |
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