I. ˈrif(ə)lə(r) noun
( -s )
Etymology: modification of French rifloir, from Middle French, from rifler to file + -oir -ory — more at rifle
: a small file with ends curved to various shapes used for working in depressions (as in die sinking)
II. noun
( -s )
Etymology: riffle (IV) + -er
: a trough used in papermaking containing upright partitions that slow the flow of pulp and permit heavy irregular particles to drop out