Main Entry: rid·er

Pronunciation: \ˈrī-dər\

Function: noun

Date: 14th century

1 : one that rides
2 a : an addition to a document (as an insurance policy) often attached on a separate piece of paper b : a clause appended to a legislative bill to secure a usually distinct object
3 : something used to overlie another or to move along on another piece

— rid·er·less \-ləs\ adjective