You searched for: “orthotropism
1. An upward, or downward, vertical growth response or tropism of organs to a given stimulus.
2. A tendency to grow upward, or downward, in a vertical direction, in response to an orienting stimulus; such as, sunlight or gravity.
This entry is located in the following units: -ism, -ismus (page 40) ortho-, orth- (page 10)