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prothallium

[proh-thal-ee-uh m] /proʊˈθæl i əm/
noun, plural prothallia
[proh-thal-ee-uh] /proʊˈθæl i ə/ (Show IPA)
1.
Botany. the gametophyte of ferns and related plants.
2.
the analogous rudimentary gametophyte of seed-bearing plants.
Origin of prothallium
1855-1860
1855-60; < New Latin < Greek pro- pro-2 + thallíon, diminutive of thallós young shoot; see -ium
Related forms
prothallial, prothallic, prothalline
[proh-thal-een, -ahyn] /proʊˈθæl in, -aɪn/ (Show IPA),
adjective
prothalloid, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for prothallium

prothallus

/prəʊˈθæləs/
noun (pl) -li (-laɪ), -lia (-lɪə)
1.
(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
prothallic, prothallial, adjective
Word Origin
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
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