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The Collaborative International Dictionary
Winterweed

Winterweed \Win"ter*weed`\, n. (Bot.) A kind of speedwell ( Veronica hederifolia) which spreads chiefly in winter.
--Dr. Prior.

Wiktionary
winterweed

n. (context botany English) ''Veronica hederifolia'', a kind of speedwell that spreads chiefly in winter.