Klamath weed
noun
the St.-John's-wort, Hypericum perforatum.
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“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.
Origin of Klamath weed
1920–25, Americanism; named after the Klamath River
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020