Pope Pius XI.
No, an encyclical is not considered infallible in the teachings of the Catholic Church.
.Catholic AnswerGeorge Tyrell was a Jesuit in the late nineteenth century, early twentieth century who condemned Pope St. Pius X encyclical condemning modernism. He was excommunicated and never recanted.
An encyclical
the encyclical
encyclical
An encyclical, which is a lengthy treatise on a subject or a motu proprio which is generally a short letter covering a particular action or subject and is meant as a clarification.
A letter from the pope to the entire Church is called an encyclical.
An encyclical is a letter from the pope to the Church. Regular bishops do not send letters to the entire Church.
An encyclical is a letter from the pope to the Church in general.
It wasn't an Encyclical, it was an Apostolic Constitution, APOSTOLIC CONSTITUTION ANGLICANORUM COETIBUS,you may view it at the link below.
Lumen Fidei was the first encyclical of Pope Francis.
-noun 1. Roman Catholic Church. a letter addressed by the pope to all the bishops of the church. -adjective 2. (of a letter) intended for wide or general circulation; general. Also, en⋅cyc⋅lic.