Epistle to the Galatians epist·le·tot·hegalatians uncommon noun 1. a New Testament book containing the epistle from Saint Paul to the Galatians SynonymsEpistle of Paul the Apostle to the GalatiansEpistle to the GalatiansGalatians Related words Broader terms book Parts New Testament WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.