cath·od·ic \(ˈ)ka|thädik, -ōd-, kəˈthä-\adjective 1. a.: of, at, or relating to a cathode < cathodic deposition of metals > — opposed to anodic b.of a chemical element: tending to form a cathode in an electrochemical cell in relation to another element, often hydrogen < copper is cathodic to zinc > 2.orkathodic: turned away — used of that half of a leaf which is turned away from the course of the genetic spiral; compare anodic • cath·od·i·cal·ly\-ə̇k(ə)lē\adverb