Late 17th century; earliest use found in Richard Wiseman (bap. 1615, d. 1676), surgeon. From classical Latin perniōn-, perniō chilblain from perna leg, thigh, ham + -iō.
Definition of pernio in US English:
pernio
nounˈpəːnɪəʊ
Medicine
A chilblain.
Origin
Late 17th century; earliest use found in Richard Wiseman (bap. 1615, d. 1676), surgeon. From classical Latin perniōn-, perniō chilblain from perna leg, thigh, ham + -iō.