Meaning & use
Tropism
Last updated
The turning or growth movement of an organism, typically a plant, toward or away from an external stimulus such as light or gravity.
See it in a sentence
Phototropism is the plant's tropism toward a light source.
Scientists study root tropism to understand how gravity guides plant growth.
A note on using this word
From Greek 'tropos' (turning); combining forms like 'phototropism' and 'geotropism' specify the stimulus involved.
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