Definition of yellowtop
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
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of yellowtop
1yellow + top
Seen and Heard
What made you want to look up yellowtop? Please tell us where you read or heard it (including the quote, if possible).