single-celled
Made up of only one cell. Bacteria are single-celled organisms.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Examples from the Web for single-celled Historical Examples of single-celled
There are many kinds of these single-celled plants in the world.
Through Magic Glasses and Other Lectures
Arabella B. Buckley
It stood out sharply when he focused—the white, jellyfish shape of a single-celled leucocyte.
Harry Harrison
They are single-celled organisms and each individual has the prime factors of life, assimilation, growth and reproduction.
Birds and Nature Vol. 9 No. 1 [January 1901]
Various
A single-celled, protoplasmic organism, which is constantly changing its form by protrusions and withdrawals of its substance.
Albert F. Blaisdell
There still exist large numbers of similar “single-celled organisms.”
The History of Creation, Vol. II (of 2)
Ernst Haeckel