Which term refers to the condition where a nail is soft and spoon-shaped?

The condition where a nail is soft and spoon-shaped is referred to as koilonychia. This term specifically describes the morphological changes that occur in the nails, resulting in a concave or "spoon" appearance. It is often associated with underlying health issues, including iron deficiency anemia, and can be an important indicator in a client's overall health profile.

In understanding this condition, it's essential to recognize how it can impact nail health and aesthetics, which are foundational aspects of manicure and pedicure practices. Koilonychia not only affects the appearance of the nails but may also impact their strength and durability, making it significant in beauty therapy.

The other terms provided in the options relate to different nail conditions: onychorrhexis refers to split or brittle nails, Beau's Lines are indentations signaling periods of growth disruption, and leuconychia describes white spots or discolorations on the nails, none of which accurately define the specific characteristics of koilonychia. Therefore, understanding koilonychia is crucial for beauty therapists in assessing and addressing client nail health.