toxoplasma Syllabification: (tox·o·plas·ma)Pronunciation: /ˌtäksəˈplazmə/Definition of toxoplasma noun a parasitic spore-forming protozoan that can sometimes cause disease in humans. Genus Toxoplasma, phylum Sporozoa, in particular T. gondii toxoplasma in other Oxford dictionaries Definition of toxoplasma in the British & World English dictionary