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dar·nel (därnəl)
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n. pl. dar·nels
Any of several ryegrasses, especially Lolium temulentum.
[Middle English, of Old North French origin; akin to French dialectal darnelle, from darne, dizzy, dazed (darnel being so called because L. temulentum, a common weed of wheat fields, is often rendered toxic by a fungal infection similar to ergot, and consumption of bread made from flour contaminated with toxic darnel causes dizziness and lethargy), of Germanic origin; akin to -daert in Middle Dutch verdaert, dazed, and -turni in Old High German biturni, dazed, both perhaps akin to Middle Dutch deren, and Old High German tarēn, tarōn, to harm, ultimately of unknown origin.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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:

    Indo-European Roots

    Semitic Roots

    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.

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