Weierstrassian adjective 1noun 1forms 3 adjective1 •Of or relating to Karl Weierstrass (1815–1897), German mathematician. noun1 •A follower of the German mathematician Karl Weierstrass (1815–1897).For the analysts, Weierstrass was the leader; his followers were proud to be known as Weierstrassians, and they constitute a school in the strict sense. — 2000 formsWeierstrassians · more Weierstrassian · most Weierstrassian