• (noun): (biology) the existence of two forms of individual within the same animal species (independent of sex differences).
    See also — Additional definitions below

Some articles on dimorphism:

Sexual Selection In Human Evolution - Sexual Dimorphism
... For example monogamous primates are known to typically exhibit little sexual dimorphism such as particularly large males armed with huge canines however, powerful big-toothed males can provide ... Bearing these caveats in mind, levels of sexual dimorphism are generally seen as a marker of sexual selection ... In contrast, gorillas living in harems exhibit a much stronger sexual dimorphism (see homininae) ...
... or amphibians) when there is no external sexual dimorphism ... developed using simple polymerase chain reaction product size dimorphism, presence/absence, restriction dimorphism, or even sequencing ...
Sexual Dimorphism Measures - Introduction
... It is widely known that sexual dimorphism is an important component of the morphological variation in biological populations (see, e.g ... In higher Primates, sexual dimorphism is also related to some aspects of the social organization and behavior (Alexander et al ... of extinct species can be inferred on the basis of sexual dimorphism and, e.g ...
Sexual Dimorphism Measures
... Although the subject of sexual dimorphism is not in itself controversial, the measures by which it is assessed differ widely ... In this review, a series of sexual dimorphism measures are discussed concerning both their definition and the probability law on which they are based ...

More definitions of "dimorphism":

  • (noun): (chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms.