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• n  (chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms
• n  (biology) the existence of two forms of individual within the same animal species (independent of sex differences)

• For example, visible anatomical differences that reveal gender sexual dimorphism are common among dinosaurs.

News & Articles

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• Are Men's Brains Just Bigger?
  The comparative anatomy of male and female brains is an incredibly popular topic. From teachers to cartoonists, everyone's interested in it. One supposed dude-dame dimorphism is the width of the corpus callosum, the white matter bridge that connects the brain's left and right hemispheres. Some studies suggest that women have a larger corpus callosum, relative to overall brain size, than men ...
  Sept. 25, 2013 - Discover

Quotes

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• Chad Johnson in Science News
  It's really the systems with more extreme sex size dimorphism that are difficult to explain,Johnson says.