1. of or relating to hyponasty; (of a plant movement) caused by greater growth on the lower surface of an organ, resulting in an upward bending or movement
Usage: botany; technical

Examples

• The hyponastic movement of the leaf caused it to curl upward as the lower surface grew more rapidly.
• Hyponastic growth is the opposite of epinastic growth in plant physiology.
• The flower's petals exhibited hyponastic behavior, opening upward in response to differential cell expansion.