or pro·car·y·ote

[ proh-kar-ee-oht, -ee-uh t ]
/ proʊˈkær iˌoʊt, -i ət /


any cellular organism that has no nuclear membrane, no organelles in the cytoplasm except ribosomes, and has its genetic material in the form of single continuous strands forming coils or loops, characteristic of all organisms in the kingdom Monera, as the bacteria and blue-green algae.
Compare eukaryote.

Origin of prokaryote

taken as singular of New Latin Prokaryota, earlier Procaryotes (1925); see pro-1, eukaryote

Related forms

pro·kar·y·ot·ic [proh-kar-ee-ot-ik] /proʊˌkær iˈɒt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for prokaryotes



/ (prəʊˈkærɪɒt) /


any organism having cells in each of which the genetic material is in a single DNA chain, not enclosed in a nucleus. Bacteria and archaeans are prokaryotesCompare eukaryote

Derived Forms

prokaryotic or procaryotic (prəʊˌkærɪˈɒtɪk), adjective

Word Origin for prokaryote

from pro- ² + karyo- + -ote as in zygote
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for prokaryotes



An organism of the kingdom Prokaryotae, constituting the bacteria and cyanobacteria, characterized by the absence of a nuclear membrane and by DNA that is not organized into chromosomes.

Related forms

pro•kar′y•otic (-ŏtĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for prokaryotes


[ prō-kărē-ōt′ ]

Any of a wide variety of one-celled organisms of the kingdom Monera (or Prokaryota) that are the most primitive and ancient known forms of life. Prokaryotes lack a distinct cell nucleus and their DNA is not organized into chromosomes. They also lack the internal structures bound by membranes called organelles, such as mitochondria. At the molecular level, prokaryotes differ from eukaryotes in the structure of their lipids and of certain metabolic enzymes, and in how genes are expressed for protein synthesis. Prokaryotes reproduce asexually and include the bacteria and blue-green algae. Also called moneran Compare eukaryote. See Table at taxonomy.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Culture definitions for prokaryotes


[ (proh-kar-ee-oht) ]

Organisms whose cells do not have a nucleus in which DNA is housed and which lack many of the organelles found in more advanced cells. The kingdom of Monera or Prokaryotae is composed of single-celled prokaryotes. (Compare eukaryotes.)


It is thought that prokaryotes were the first cells to appear on Earth.
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.