Definition of sun animalcule in English:

sun animalcule

noun

  • Any of the protozoans of the order Heliozoa, especially Actinophrys sol, typically having a spherical body with numerous long slender radial pseudopodia (thought to resemble an image of the sun).

Origin

Mid 19th century; earliest use found in Andrew Pritchard (1804–1882), microscopist. After German Sonnentierchen.