noun
a genus of freshwater protozoans characterized by a spherical shape and radiating pseudopods
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Actinosphaerium is a genus of freshwater protozoa characterized by a spherical shape and radiating spines.
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I saw a cool video of actinosphaerium moving under a microscope.
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That actinosphaerium looks like a tiny alien spaceship!
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The actinosphaerium's spines reminded me of a sunburst in the sky.