prothallus

[ proh-thal-uhs ]

/ proʊˈθæl əs /

noun, plural pro·thal·li [proh-thal-ahy]. /proʊˈθæl aɪ/. Botany.

prothallium.

Origin of prothallus

From New Latin, dating back to 1850–55; see origin at pro-², thallus

Words nearby prothallus

Proteus syndrome, Proteus vulgaris, prothalamion, prothalamium, prothallium, prothallus, prothesis, prothonotary, prothonotary apostolic, prothonotary warbler, prothoracic gland

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

Example sentences from the Web for prothallus

The prothallus is a small underground body destitute of chlorophyll.
How to Know the Ferns|S. Leonard Bastin
The prothallus is exceedingly small, being little more than a group of cells forming an antheridium.
How to Know the Ferns|S. Leonard Bastin
Prothallus green, formed upon the ground, often variously lobed, usually dicious.
The Manual of the Botany of the Northern United States|Asa Gray
In the case of L. inundatum the length of time which elapses between the coming of the prothallus is nothing like so great.
How to Know the Ferns|S. Leonard Bastin

As a rule, too, in the prothallus only one of the archegonia shows any further signs of development.
How to Know the Ferns|S. Leonard Bastin

British Dictionary definitions for prothallus

prothallus

prothallium (prəʊˈθælɪəm)

/ (prəʊˈθæləs) /

noun plural -li (-laɪ) or -lia (-lɪə)

botany the small flat free-living gametophyte that bears the reproductive organs of ferns, horsetails, and club mosses. It is either a green disc on the soil surface or it is colourless and subterranean

Derived forms of prothallus

prothallic or prothallial, adjective

Word Origin for prothallus

C19: from New Latin, from pro- before + Greek thallus a young shoot

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 prothallus

prothallus

[ prō-thăl′əs ]

Plural prothalli (prō-thăl′ī)

The gametophyte of homosporous ferns and some other plants. Prothalli have chlorophyll for photosynthesis, but they are not differentiated into roots, stems, or leaves. They are usually small, flat, and delicate. Prothalli develop from germinated spores, and they bear both archegonia for producing eggs and antheridia for producing sperm. See more at alternation of generations.

单词	prothallus
释义	prothallus [ proh-thal-uhs ] / proʊˈθæl əs / noun, plural pro·thal·li [proh-thal-ahy]. /proʊˈθæl aɪ/. Botany. prothallium. Origin of prothallus From New Latin, dating back to 1850–55; see origin at pro-², thallus Words nearby prothallus Proteus syndrome, Proteus vulgaris, prothalamion, prothalamium, prothallium, prothallus, prothesis, prothonotary, prothonotary apostolic, prothonotary warbler, prothoracic gland Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for prothallus The prothallus is a small underground body destitute of chlorophyll. How to Know the Ferns\|S. Leonard Bastin The prothallus is exceedingly small, being little more than a group of cells forming an antheridium. How to Know the Ferns\|S. Leonard Bastin Prothallus green, formed upon the ground, often variously lobed, usually dicious. The Manual of the Botany of the Northern United States\|Asa Gray In the case of L. inundatum the length of time which elapses between the coming of the prothallus is nothing like so great. How to Know the Ferns\|S. Leonard Bastin As a rule, too, in the prothallus only one of the archegonia shows any further signs of development. How to Know the Ferns\|S. Leonard Bastin British Dictionary definitions for prothallus prothallus prothallium (prəʊˈθælɪəm) / (prəʊˈθæləs) / noun plural -li (-laɪ) or -lia (-lɪə) botany the small flat free-living gametophyte that bears the reproductive organs of ferns, horsetails, and club mosses. It is either a green disc on the soil surface or it is colourless and subterranean Derived forms of prothallus prothallic or prothallial, adjective Word Origin for prothallus C19: from New Latin, from pro- before + Greek thallus a young shoot 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 prothallus prothallus [ prō-thăl′əs ] Plural prothalli (prō-thăl′ī) The gametophyte of homosporous ferns and some other plants. Prothalli have chlorophyll for photosynthesis, but they are not differentiated into roots, stems, or leaves. They are usually small, flat, and delicate. Prothalli develop from germinated spores, and they bear both archegonia for producing eggs and antheridia for producing sperm. See more at alternation of generations. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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