pernio

Etymology
.

Usage notes
Of the major English dictionaries that enter at all, most enter only  for the plural form. As with other words naturalized into English from ancient Latin or New Latin, the Latin plural inflection and the English plural inflection have both been used, and there is no general rule for which one is considered preferable, as preference varies by word, dictionary, academic field, and commentator (e.g., versus,  versus ,  versus ).

Etymology
From.

Noun

 * 1) A kibe on the foot, a chilblain