noun
- a microscopic marine protozoan with a silica shell and radiating pseudopodia
Usage: biology
adjective
- relating to or characteristic of radiolarians
Usage: biology
Examples
- The radiolarian fossils provided evidence of ancient ocean conditions.
- Scientists studied radiolarian skeletons under the microscope.
- Radiolarian ooze covers large areas of the ocean floor.
- The radiolarian species displayed intricate geometric patterns.
- Marine biologists collected radiolarian samples from deep water.
- Radiolarian shells are made of silica rather than calcium carbonate.