The Collaborative International Dictionary
Hyponasty \Hy`po*nas"ty\, n. (Bot.) Downward convexity, or convexity of the inferior surface.
Wiktionary
n. (context botany English) an upward bending of leaves or other plant parts, caused by increased growth on their lower surface
Usage examples of "hyponasty".
As the arching occurred in whatever position the seeds were placed, it is no doubt due to temporarily increased growth of the nature of epinasty or hyponasty along one side of the part.
As this upward movement occurred with plants kept in the dark and in whatever position the main peduncle was fastened, it could not have been caused by heliotropism or apogeotropism, but by hyponasty.
C, subsequent upward movement, due to apogeotropism and hyponasty combined.
Afterwards they are carried upwards by apogeotropism in combination with hyponasty, and are thus enabled to scatter their seeds over a wider space.
We will therefore speak of circumnutation, which is always in progress, as modified by epinasty, hyponasty, geotropism, or other agencies, whether internal or external.