Definition

A plant of the genus Heliotropium, also called heliotrope, known for its flowers that turn to follow the sun throughout the day. In chemistry, it refers to a dye or pigment extracted from lichens that changes color based on pH levels.

Example Usage

The turnsole plant in the botanical garden was a favorite spot for visitors who wanted to observe heliotropic behavior.

Origin

From Old French 'tournesol,' literally 'turn-sun,' from 'tourner' (to turn) and 'sol' (sun).

Fun Fact

Medieval alchemists prized turnsole as a natural pH indicator long before modern litmus paper was invented.

Source: Definition backfill (hailey)

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