You searched for: “actograph”
actograph (s) (noun), actographs (pl)
A recording instrument for indicating the movements of a person sleeping: When Jane complained about not sleeping well, her doctor suggested that an actograph could be used in order to find out more about her ailment.
This entry is located in the following units: ag-, agen-, act-, agi-, agit- (page 2) grapho-, graph-, -graph, -graphy, -grapher, -graphia (page 1)