pleomorphic

This term is primarily used in specialized scientific contexts, specifically microbiology, pathology, and virology. It describes a biological entity that does not adhere to a single, consistent shape, but instead manifests in various forms or possesses the capacity to alter its morphology. In a clinical setting, it often signals an abnormality or a specific characteristic of a pathogen that complicates identification.

Because it is a technical descriptor, it is rarely used in casual conversation. It differs from "polymorphic" in that pleomorphism typically refers to the variability of individual cells or organisms of the same species, whereas polymorphism often refers to the occurrence of two or more distinct forms within a population.