Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Growth or movement of a sessile organism in response to gravity, as the downward growth of plant roots.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biology, botany a plant's ability to change its growth in response to gravity.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[gravi(ty) + –tropism.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

gravi- +‎ tropism

Examples

Comments

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  • Charles Darwin was one of the first to scientifically document that roots show positive gravitropism and stems show negative gravitropism. That is, roots grow in the direction of gravitational pull (i.e., downward) and stems grow in the opposite direction (i.e., upwards).

    June 24, 2015