dimorphism.

1. The occurrence of two distinguishable forms within a species or biological population.

2. The occurrence of a substance in two distinct crystalline forms.

Use it for

Words that belong together

• sexual dimorphism
• seasonal dimorphism

On the page

Seasonal dimorphism made the summer specimens difficult to compare with the winter ones.

They measured sexual dimorphism without treating every individual as a perfect example of either average.

Usage notes

Primary category: sci-fi. Forms: Usually uncountable. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.