What terminology is used to describe the shape of the nail?

The terminology used to describe the shape of the nail is referred to as "nail plate morphology." This term encompasses the study and classification of the various forms and shapes that nails can take. Nail plate morphology includes aspects such as thickness, curvature, and overall nail shape, which are important for understanding nail health and for performing services in cosmetology.

In contrast, while "nail structure" may refer to the components that make up the nail, it doesn't specifically address the various shapes or forms that nails can take. "Nail design" typically pertains to decorative elements applied to the nail surface, such as nail art or polish techniques, rather than the physical characteristics of the nail itself. "Nail contour" might suggest the outline or edge of the nail, but it is not a comprehensive term that captures the full concept of shape as embraced by nail plate morphology. Thus, nail plate morphology is the most accurate and comprehensive term for discussing the shape of the nail.