n. pl. pro·to·ne·ma·ta (-nēmə-tə, -nĕmə-)
The filamentous growth that arises following spore germination in liverworts and mosses and develops into a mature gametophyte.
pro′to·nemal (-nēməl), pro′to·nema·tal (-nēmə-təl, -nĕmə-) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.