Usually means: Extinct, reef-building marine bivalves.
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We found 5 dictionaries that define the word rudist:

General (3 matching dictionaries)
  1. rudist: Oxford Learner's Dictionaries
  2. rudist: Wiktionary
  3. Rudist: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Rudist: Encyclopedia

Science (1 matching dictionary)
  1. Rudist: USGS Paleontology Glossary of Terms

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Definitions from Wiktionary (rudist)

▸ noun:  (paleontology) Any of many box-, tube- or ring-shaped marine heterodont bivalves from the Jurassic and Cretaceous periods.

Similar:
cryptodont, heterodont, cyrtodontid, megalodontid, rhizodontid, bidentalian, radiolitid, strophomenid, rhabdosteid, orthid, more...

Opposite:
polite, courteous, respectful, well-mannered, civil

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Similar:
cryptodont, heterodont, cyrtodontid, megalodontid, rhizodontid, bidentalian, radiolitid, strophomenid, rhabdosteid, orthid, more...

Opposite:
polite, courteous, respectful, well-mannered, civil



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