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See also: Darwin





Named after Charles Darwin, coined by J.B.S. Haldane in 1949.



darwin (plural darwins)

  1. A unit of evolutionary change in evolutionary biology.
    • 1999, J. William Schopf, Evolution!: Facts and Fallacies, page 50:
      One darwin (d) equals the rate of evolution that would produce a change in size by a factor of approximately 2.7 in one million years.
    • 2003, Donald Mitchell, The 2,000 Percent Solution, page 243:
      The rate of evolutionary change in a species' wing or leg or beak (remember Darwin's finches mentioned in Chapter 1?) is assessed in degree-of-physical-change units called darwins.
    • 2010, Sahotra Sarkar, Anya Plutynski, A Companion to the Philosophy of Biology, page 177:
      For instance, gradual change is relatively common in vertebrates (about .08 darwins), though some rapidly evolving vertebrates lineages show rates as high as 10 darwins, over short periods.

Derived terms

  • d (abbreviation)

See also