isogram

English

Etymology

From iso- +‎ -gram. The "contour line" sense was proposed in 1889 by Francis Galton.[1]

Noun

isogram (plural isograms)

  1. A word in which no letter of the alphabet occurs more than once.
    • 2017 January 1, Florian Breit, “The Distribution of English Isograms in Google Ngrams and the British National Corpus”, in Bangor University‎[2], page 2:
      For convenience, we can refer to an isogram of order n as an n-isogram. The examples in (2a) are 1-isograms, (2b) 2-isograms, and (2c) 3-isograms. Second- and third-order isograms are also sometimes referred to as pair and trio isograms respectively, but I will not use these terms here.
  2. A line on a map or chart, such as a contour line, joining points that have the same value for some quantity.
    Synonyms: isoline, isopleth, isarithm

Derived terms

References

  1. ^ Norman Joseph William Thrower (1972) Maps and Man‎[1], page 164

Anagrams

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