The Collaborative International Dictionary of English v.0.48:
Heliozoa \He`li*o*zo"a\, n. pl. [NL., fr. Gr. ? the sun + zo^,on an animal.] (Zool.) An order of fresh-water rhizopods having a more or less globular form, with slender radiating pseudopodia; the sun animalcule.WordNet (r) 3.0 (2006):
Heliozoa n 1: mostly freshwater protozoa [syn: Heliozoa, order Heliozoa]