From the Latin dexter meaning on the right side. For example, a molecule that shows dextrorotation is turning or twisting to the right. The opposition of dextro- is levo- (from the Latin laevus meaning on the left side) so the opposite of dextrorotation is levorotation.
DEXTRO-
Meaning of DEXTRO- in English
English dictionary of medicine. Английский словарь медицины. 2012