bugicide noun2 •A substance that kills bugs.“Tincture of bugicide,” he thought, would occupy an honored place on the shelves of future druggists, for he was a firm believer in the germ theory. — 1883 •(rare) The killing of a bug.It turned out that the Roaches were cockroaches and the girl was found guilty of justifiable “bugicide.” — 1869 formsbugicides