isa·ian \īˈzāən, chiefly Brit -zīən\adjective orisa·ian·ic\| ̷ ̷(ˌ) ̷ ̷|anik\ Usage: usually capitalized Etymology:isaian from Isaiah, 8th century B.C. major Hebrew prophet + English -an, adjective suffix; isaianic from Isaiah + English -an, adjective suffix + -ic : of, relating to, or having the characteristics of Isaiah or the book of Isaiah < the Isaianic character of this prophesy — Robert Gordis > < the somber and threatening, the almost Isaian, utterance — Edmund Wilson >