co·au·thor or co-au·thor (kō-ô'thər) n. A collaborating or joint author. tr.v.
co·au·thored or co-au·thored, co·au·thor·ing or co-au·thor·ing, co·au·thors or co-au·thors To be a collaborating or joint author of: "He and a colleague . . . co-authored a genetics text"(Roger W. Pease, Jr.)