Originally: a histogram. In later use also: a line chart representing the information displayed in a histogram, formed by joining the midpoint of the apex of each bar.
Origin
Early 20th century. From histo- + -graph.
Definition of histograph in US English:
histograph
noun
Statistics
Originally: a histogram. In later use also: a line chart representing the information displayed in a histogram, formed by joining the midpoint of the apex of each bar.