WordReference Random House Unabridged Dictionary of American English © 2026
hope′ful mon′ster, [Biol.]
  1. Biologya hypothetical individual organism that, by means of a fortuitous macromutation permitting an adaptive shift to a new mode of life, becomes the founder of a new type of organism and a vehicle of macroevolution.
  • phrase introduced by German geneticist Richard B. Goldschmidt (1879–1958) 1933


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