Main Entry: an·a·logue

Variant(s): or an·a·log \ˈan-^əl-ˌȯg, -ˌäg\

Function: noun

1 : something that is analogous or similar to something else
2 : an organ similar in function to an organ of another animal or plant but different in structure and origin
3 usually analog : a chemical compound that is structurally similar to another but differs slightly in composition (as in the replacement of one atom by an atom of a different element or in the presence of a particular functional group)