DEMAS (dē'măs, Gr. Dēmas, popular). A faithful helper of Paul during his imprisonment in Rome (Col.4.14). Paul called him a “fellow worker” (Phlm.1.24). He was probably a citizen of Thessalonica, where he went when he deserted Paul (2Tim.4.10).

International Standard Bible Encyclopedia (1915)

According to Col 4:14; 2Ti 4:10; Phm 1:24, one who was for a time a "fellow-worker" with Paul at Rome (Col, Philem), but at last, "having loved this present world," forsook the apostle and betook himself to Thessalonica (2 Tim). No other particulars are given concerning him. See Apostasy; Demetrius.