Botany. noting or pertaining to a vernation in which two leaves are folded together in the bud so that one half of each is exterior and the other interior.
Origin: 1750–60; < L obvolūtus (ptp. of obvolvere to cover by wrapping up), equiv. to ob-ob-+ volū-, base of volvere to turn, roll + -tus ptp. suffix; see volute
[ob-vuh-loot] 
vəˌlut