protonema

[ proh-tuh-nee-muh ]

/ ˌproʊ təˈni mə /

noun, plural pro·to·ne·ma·ta [proh-tuh-nee-muh-tuh]. /ˌproʊ təˈni mə tə/. Botany.

a primary, usually filamentous structure produced by the germination of the spore in mosses and certain related plants, and from which the leafy plant which bears the sexual organs arises as a lateral or terminal shoot.

Origin of protonema

1855–60; <New Latin <Greek prōto-proto- + nêma thread

OTHER WORDS FROM protonema

pro·to·ne·mal, adjective

Words nearby protonema

protolithic, protolog, protomartyr, protomorphic, proton, protonema, protonic, Protonix, proton microscope, proton number, Proto-Norse

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for protonema

The protonema is always a well-marked stage in the life-history.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3|Various
The formation of the moss-plant on the protonema is always from a single cell and is similar in all mosses.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3|Various
Usually the protonema is filamentous and ceases to be evident after the plants have developed.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3|Various
In Ephemerum also we may probably regard the relation of the small plants to the protonema as a primitive one.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3|Various

The protonema is not persistent, and the plants are well developed, resembling those of Pleuridium.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3|Various

British Dictionary definitions for protonema

protonema

/ (ˌprəʊtəˈniːmə) /

noun plural -nemata (-ˈniːmətə)

a branched threadlike structure that grows from a moss spore and eventually develops into the moss plant

Derived forms of protonema

protonemal or protonematal (ˌprəʊtəˈniːmətəl, -ˈnɛmətəl), adjective

Word Origin for protonema

C19: from New Latin, from proto- + Greek nema thread

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

Scientific definitions for protonema

protonema

[ prō′tə-nē′mə ]

Plural protonemata (prō′tə-nē′mə-tə, -nĕm′ə-)

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.

单词	protonema
释义	protonema [ proh-tuh-nee-muh ] / ˌproʊ təˈni mə / noun, plural pro·to·ne·ma·ta [proh-tuh-nee-muh-tuh]. /ˌproʊ təˈni mə tə/. Botany. a primary, usually filamentous structure produced by the germination of the spore in mosses and certain related plants, and from which the leafy plant which bears the sexual organs arises as a lateral or terminal shoot. Origin of protonema 1855–60; <New Latin <Greek prōto-proto- + nêma thread OTHER WORDS FROM protonema pro·to·ne·mal, adjective Words nearby protonema protolithic, protolog, protomartyr, protomorphic, proton, protonema, protonic, Protonix, proton microscope, proton number, Proto-Norse Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for protonema The protonema is always a well-marked stage in the life-history. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3\|Various The formation of the moss-plant on the protonema is always from a single cell and is similar in all mosses. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3\|Various Usually the protonema is filamentous and ceases to be evident after the plants have developed. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3\|Various In Ephemerum also we may probably regard the relation of the small plants to the protonema as a primitive one. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3\|Various The protonema is not persistent, and the plants are well developed, resembling those of Pleuridium. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3\|Various British Dictionary definitions for protonema protonema / (ˌprəʊtəˈniːmə) / noun plural -nemata (-ˈniːmətə) a branched threadlike structure that grows from a moss spore and eventually develops into the moss plant Derived forms of protonema protonemal or protonematal (ˌprəʊtəˈniːmətəl, -ˈnɛmətəl), adjective Word Origin for protonema C19: from New Latin, from proto- + Greek nema thread 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 Scientific definitions for protonema protonema [ prō′tə-nē′mə ] Plural protonemata (prō′tə-nē′mə-tə, -nĕm′ə-) 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. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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