noun
1. (chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms
• Topics: ↑chemistry, ↑chemical science
• Hypernyms: ↑polymorphism, ↑pleomorphism
2. (biology) the existence of two forms of individual within the same animal species (independent of sex differences)
• Topics: ↑biology, ↑biological science
• Hypernyms: ↑polymorphism
Useful english dictionary. 2012.