(noun; Greek anatrepein
, to turn over): 1. Increase of movement during blastokinesis
2. (Arthropoda: Insecta) In blastokinesis, a term used to describe the movement of the embryo inside the egg from one pole to another; refers to different activities in different groups of insects, i.e., ventral to dorsal, dorsal to ventral
See also: katatrepsis.