One of the mysteries of the English language finally explained.
The disease yaws.
Early 17th century; earliest use found in Samuel Purchas. From French pian from Tupi pi'ã. Compare Guarani pia ‘bubas, granos’.
Of or relating to any of the Popes named Pius; specifically of or relating to the pontificate or liturgical reforms of Pope Pius V (1566–72) or the pontificate of Pope Pius X (1903–14).
Early 20th century; earliest use found in The Month: an illustrated magazine of literature, science and art. From Pius, use as male forename of classical Latin pius pious, dutiful + -an, originally after the name of Pope Pius V, who introduced a new breviary in 1568, subsequently also after the name of Pius X.
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