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Noun. 1. simple-any herbaceous plant having medicinal properties. archaicism, archaism-the use of an archaic expression. herb, herbaceous plant-a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests.
Princeton's WordNet (0.00 / 0 votes) Rate this definition: simple (noun). any herbaceous plant having medicinal properties. simpleton, simple (adj). a person lacking intelligence or common sense. simple (adj).