multirotation

from The Century Dictionary.

• noun In chem. and physical, the power possessed by solutions of certain optically active sugars, hydroxy-acids, lactones, and other compounds of changing their rotatory power according to the length of time they have been in solution. A constant value for the rotation is finally obtained, which may be greater or less than the initial one. This phenomenon is probably due to the formation of hydrates of the active compound. Also mutarotation.