A single-celled animal that catches food and moves about by extending fingerlike projections of protoplasm. Amoebas are either free-living in damp environments or parasitic.
- ‘Pheromones are widespread in the animal world, from the single-celled amoeba to human beings.’
- ‘The virus lives in single-celled organisms called amoebae and may be able to infect humans.’
- ‘To put this time span in perspective, two billion years ago our ancestors were microscopic single-celled amoebas.’
- ‘It must have a flexible structure that can expand and change, in much the same way that an amoeba adapts to its environment.’
- ‘Contact with protozoa, the tremendously varied group of more sophisticated single-celled microbes that includes amoeba and paramecium, has also been greatly reduced in the developed world by water and food treatment measures.’
Mid 19th century: modern Latin, from Greek amoibē change, alternation.