Definition of "single-celled" [single-celled]

• Having a single cell (and thus not divided into cells) (adjective)

WordNet. Princeton University. 2010.

• "All proteins in all organisms in the whole world are always made of amino acids that cause light to rotate counterclockwise except for a few rare and highly unusual single-celled organisms."
• "There are no transitional forms between single-celled and five-hundred-celled organisms."
• "From that time, the idea spread that life on earth was not created by God but came into being by pure chance and that life subsequently evolved spontaneously from a single-celled organism into the millions of different species of plants and animals we know now."