protonema definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- protonemal adjective
protonema definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
noun pl. pro·to·ne·ma·ta
The green filamentous growth that arises from spore germination in liverworts and mosses and eventually gives rise to a mature gametophyte.
Origin: proto- + Greek nēma, thread; see (s)nē- in Indo-European roots.
- proˌto·neˈmal , proˌto·neˈma·tal adjective
protonema - Science Definition
Plural protonemata protonemata
The green filamentous or flat, thallus-like structure that grows from the germinated spores of liverworts and mosses and eventually gives rise to a mature gametophyte.