Source : Webster's Revised Unabridged Dictionary (1913)

Heliozoa \He`li*o*zo"a\, n. pl. [NL., fr. Gr. ? the sun + ? an
   animal.] (Zo["o]l.)
   An order of fresh-water rhizopods having a more or less
   globular form, with slender radiating pseudopodia; the sun
   animalcule.

Source : WordNet®

Heliozoa
     n : mostly freshwater protozoa [syn: {order Heliozoa}]