1) Acellular 2) Cell-free 3) One-celled 4) Single-celled 1) Acellular 
1. Lacking cellular organization, as applied to viruses, which can only replicate within a cell, whether prokaryotic or eukaryotic. ... Synonym: subcellular. ... Synonym: acellular. ... (05 Mar 2000) ... 
Type: Term Pronunciation: non-sel′yū-lăr Definitions: 1. Lacking cellular organization, as applied to viruses, which can only replicate within a cell, whether prokaryotic or eukaryotic. Synonyms: acellular1, subcellular
[adj] - not made up of or divided into cells
acellular adjective not made up of or divided into cells
not composed of or containing cells: Cytoplasm is noncellular.