euploid

This term is used exclusively within genetics and cytology to describe a state of chromosomal normality or balanced multiplication. It carries a neutral, descriptive tone and is typically contrasted with "aneuploid," which refers to an abnormal number of chromosomes. In a clinical or laboratory setting, it indicates that the genetic makeup of a cell or organism adheres to the expected mathematical multiples of the species' base set.

When used as a noun, the term refers to the entity itself, such as a specific cell line or an individual organism. Because it describes a biological state, it is used in highly technical registers, such as medical reports, peer-reviewed research papers, and genetic counseling, and is rarely encountered in general conversation.