Rad Trad 

A short form of the term Radical Traditionalist. A 'Rad Trad' is a Catholic who adheres to pre-1960's traditions, especially the Latin Mass in favour of the Novus Ordo (post-Vatican II mass). They're basically hardcore for all things pre-Vatican II and they reject aspects of modern Catholicism. Most would consider themselves in union with the Catholic Church, though.

"Lately, after Mass, he keeps on saying how he wishes our parish had Latin Mass instead. I’m starting to think he might be turning into a Rad Trad."

Rad Trad by i_liketrombonesIJN August 31, 2025

RadTrad 

In the Catholic faith, a derogatory word for "radical traditionalist." This generally involves the following things:
1) Rejection of Vatican II
2) Rejection of the non-Latin mass
3) Rejection of the authority of the current bishops and pope

He was so disgusted by the homilies at his parish that he started going to an SSPX chapel and now he's a complete RadTrad.

RadTrad by joye April 30, 2006

RADTRAD 

RADionuclide, Transport, Removal, and Dose Estimation

A computer code developed by the NRC for radiological dose analysis around nuclear plants.

RADTRAD version 5.0.2 was released October 24th, 2019.

RADTRAD by ScienceGeek101 February 13, 2020