birdweed

English

Etymology

From bird +‎ weed.

Noun

birdweed (countable and uncountable, plural birdweeds)

1. Any of certain species of plants of the genus Polygonum, especially
   1. Polygonum aviculare (common knotgrass)

References

• Polygonum on Wikipedia.Wikipedia
• “birdweed”, in OneLook Dictionary Search.