orthotropism

[ awr-tho-truh-piz-uh m ]
/ ɔrˈθɒ trəˌpɪz əm /

noun

Botany. orthotropic tendency or growth.

Origin of orthotropism

First recorded in 1880–85; ortho- + -tropism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019