gros (`araphel): Used twice with "darkness" in Isa 60:2; Jer 13:16. In the New Testament the verb pachuno, "to make fat," is applied twice to "making gross" the heart (Mt 13:15; Acts 28:27). See GREASE.
Bibliography Information Orr, James, M.A., D.D. General Editor. "Definition for 'GROSS'". "International Standard Bible Encyclopedia". bible-history.com - ISBE; 1915.