Definition of yellowtop

1a : any of several goldenrods especially : early goldenrod sometimes plural but singular in construction
2 : any of several plant diseases characterized by yellowing of the upper foliage: such as
a : a disease of alfalfa of undetermined cause characterized by a pronounced yellowing of the upper portions of affected plants
b : a yellowing of alfalfa tops caused by the punctures of the potato leafhopper

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for yellowtop

yellow entry 1 + top

Keep scrolling for more

Learn More about yellowtop

Statistics for yellowtop

Cite this Entry

“Yellowtop.” Dictionary, Merriam-Webster, Accessed 12 Aug. 2020.

Comments on yellowtop

What made you want to look up yellowtop? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!