Superficial fungal infection of hair resulting in the formation of small nodules on or within the hair shafts.
Origin
Late 19th century; earliest use found in The Lancet. From French piedra from Spanish piedra, specifically use of piedra stone from classical Latin petra.
Definition of piedra in US English:
piedra
nounpɪˈɛdrə
Medicine
Superficial fungal infection of hair resulting in the formation of small nodules on or within the hair shafts.
Origin
Late 19th century; earliest use found in The Lancet. From French piedra from Spanish piedra, specifically use of piedra stone from classical Latin petra.