Whereover is a related term of thereover.
As adverbs the difference between whereover and thereover
is that whereover
is (archaic) over what while thereover
is over that.
As a conjunction whereover
is (archaic) over what.
(archaic) Over what.
* 1977 , J K Paul, Solar heating and cooling: recent advances?
- The collector sheet preferably has embossing to help spread liquids flowing thereover , to increase heat transfer to the liquid flowing thereover...