buttonweed

noun

1

: a small troublesome weed (Diodia teres) with linear leaves and small flowers and fruits resembling buttons

2

: any of several plants of the genus Spermacoce (family Rubiaceae) of similar appearance to buttonweed

3

: indian mallow

4

: knapweed

5

: clustered bluet

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now