WordReference Random House Unabridged Dictionary of American English © 2024his•to•gram (his′tə gram′),USA pronunciation n. [Statistics.]- Statisticsa graph of a frequency distribution in which rectangles with bases on the horizontal axis are given widths equal to the class intervals and heights equal to the corresponding frequencies.
Collins Concise English Dictionary © HarperCollins Publishers::
histogram /ˈhɪstəˌɡræm/ n - a statistical graph that represents the frequency of values of a quantity by vertical rectangles of varying heights and widths. The width of the rectangles is in proportion to the class interval under consideration, and their areas represent the relative frequency of the phenomenon in question
Etymology: 20th Century: perhaps from histo( ry) + -gram