n.
Pronunciation: ' r ī -d ə r
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 \ -l ə s \ adjective