The bending or twining of any part of a plant toward one side or the other, or in any direction from the vertical.
Webster 1828 Edition
Intorsion
INTOR'SION
,
Noun.
[L. intorqueo, intorsum, to twist.]
A winding, bending or twisting. In botany, the bending or twining of any part of a plant towards one side or the other, or in any direction from the vertical.