cath ‧ ode /ˈkæθəʊd $ -θoʊd/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Greek ; Origin: kathodos 'way down' , from kata- ( ⇨ ↑ cataclysm ) + hodos 'way' ]
technical the negative ↑ electrode , marked (-), from which an electric current leaves a piece of equipment such as a ↑ battery OPP anode