A subordinate or secondary element.

plural of driven element

plural of parasitic element

(radio) An element of an antenna that receives power directly from the transmitter.

(electronics) A circuit element or property that is present within an electrical component, and has a negative effect on the performance of the circuit.

plural of identity element

(category theory) The identity element of an object when thought of as a generalized element of that object.

(category theory) A morphism whose codomain is some specified object.

plural of finite element

plural of element of surprise