any of several weeds of the genus Polygonum, having a smarting, acrid juice.

Origin of smartweed

First recorded in 1780–90; smart + weed1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for smartweed

Historical Examples of smartweed

  • It is a near relative of knot grass and smartweed and Prince's feather.

    Seed Dispersal

    William J. Beal

  • A good yellow can be obtained by experimenting with smartweed.

    Practical Basketry

    Anna A. Gill

  • There are several common "weeds" belonging to this family, such as Dock, Sorrel, and Smartweed.

  • The white-throated sparrow, a large and very pretty bird, eats the seeds of smartweed and ragweed.

    The Children's Book of Birds

    Olive Thorne Miller

  • Ragweed and smartweed seeds are dainties to him as some nuts are to you, and he eats a great many.

    The Children's Book of Birds

    Olive Thorne Miller