noun Statistics.
a 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.

1890–95; histo- + -gram1

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World English Dictionary
histogram (ˈhɪstəˌɡræm)
See also stem-and-leaf diagram 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
[C20: perhaps from histo(ry) + -gram]

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Example sentences
It's not clear, though, if the same adjustments were made to both the line plot
  and the histogram but probably were.
The results are basically a histogram where you compare size versus frequency.
The cool thing is the histogram it displays showing the distribution of both
  the particle energies and particle speeds.
The histogram record is used to store frequency counts of a signal into an
  array of arbitrary length.
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