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heliotrope (n.)[heliotrope 词源字典]: "plant which turns its flowers and leaves to the sun," 1620s, from French héliotrope (14c.) and directly from Latin heliotropium, from Greek heliotropion, from helios "sun" (see sol) + tropos "turn" (see trope). The word was applied c. 1000-1600 in Latin form to sunflowers and marigolds. Related: Heliotropic.[heliotrope etymology, heliotrope origin, 英语词源]