noun (used with a singular verb)
either of two books of the New Testament, I Thessalonians or II Thessalonians, written by Paul. Abbreviation: Thes., Thess.
Origin of Thessalonian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(functioning as singular) either of two books of the New Testament (in full The First and Second Epistles of Paul the Apostle to the Thessalonians)
of or relating to ancient Thessalonica (modern Salonika)
an inhabitant of ancient Thessalonica
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012