‖O‐lu″sa‐trum (?), n. [L. holusatrum, olusatrum; olus garden herb + ater black.] (Bot.) An umbelliferous plant, the common Alexanders of Western Europe (Smyrnium Olusatrum).
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.