Definition of loosestrife
1
: any of a genus (Lysimachia) of plants of the primrose family with leafy stems and usually yellow or white flowers
2
: any of a genus (Lythrum, family Lythraceae, the loosestrife family) of herbs having entire leaves and including some with showy spikes of purple flowers
especially
: purple loosestrife
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Merriam-Webster unabridged
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Time Traveler for loosestrife
The first known use of loosestrife was in 1548
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