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The Collaborative International Dictionary
Neckweed

Neckweed \Neck"weed`\, n. (Bot.)

  1. An American annual weed ( veronica peregrina), with small white flowers and a roundish pod.

  2. The hemp; -- so called as furnishing ropes for hanging criminals.
    --Dr. Prior.

Wiktionary
neckweed

n. 1 An American annual weed ((taxlink Veronica peregrina species noshow=1)), with small white flowers and a roundish pod. 2 (context humorous archaic English) The hemp plant, which furnishes ropes for hanging criminals.