— washerless , adj.
/wosh"euhr, waw"sheuhr/ , n.
1. a person or thing that washes.
2. See washing machine .
3. a flat ring or perforated piece of leather, rubber, metal, etc., used to give tightness to a joint, to prevent leakage, to distribute pressure, etc., as under the head of a nut or bolt.
[ 1275-1325; ME; see WASH, -ER 1 ]