asbestic adjective 1noun 1forms 2 adjective1 •Relating to, or resembling, asbestos. noun1 •A type of wall plaster that is a byproduct of the manufacture of asbestos from serpentine.After the lime and asbestic are thoroughly mixed, the plaster should be allowed to stand at least twenty-four hours before being used. — 1897 formsmore asbestic · most asbestic