a·moe·ba also a·me·ba (ə-mēbə)
n. pl. a·moe·bas or a·moe·bae (-bē) also a·me·bas or a·me·bae
Any of various one-celled free-living or parasitic protozoans having no definite form and moving by means of pseudopods.
[New Latin Amoeba, genus name, from Greek amoibē, change, from ameibein, to change; see mei-1 in the Appendix of Indo-European roots.]
a·moebic (-bĭk) adj.
(click for a larger image)amoeba
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.