What is the term for a nail condition characterized by abnormally thick nails?

The term for a nail condition characterized by abnormally thick nails is onychogryphosis. This condition often involves not only thickening but also a change in the shape of the nail, leading to a claw-like appearance. It can result from a variety of factors, including fungal infections, trauma, or other underlying health issues. This condition is distinct because it prominently features the abnormal thickening of the nail plate itself, setting it apart from other nail disorders.

Other terms mentioned in the options refer to different nail issues. For example, onychorrhexis refers to the splitting or brittle nails, while hyperonychosis describes an increase in the amount of tissue around the nail. Onychatrophia signifies the wasting away or atrophy of the nail plate. Each of these conditions highlights different abnormalities that can occur with nails but does not specifically address the characteristic of abnormal thickening found in onychogryphosis.