Definition of prothallus in English:

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Pronunciation: /prōˈTHaləs/

noun (plural prothalli /-ˈTHalē/ /ˈTHalˌī/)

The gametophyte of ferns and other primitive plants.
Example sentences
  • Here I re-examine the formation of the prothallus in a fern gametophyte in the context of a ‘whole-plant’ developmental response.



Pronunciation: /-ˈTHalēəl/
Example sentences
  • A consistent feature of every experiment that was undertaken in this study was that a sufficient quantity of white light was an absolute requirement for both prothallial and rhizoid development.
  • The grain is empty because the body cell and prothallial nuclei have moved out along the pollen tube towards the archegonia.


Mid 19th century: modern Latin, from pro-2 'before, earlier' + Greek thallos 'green shoot'.

For editors and proofreaders

Syllabification: pro·thal·lus

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