- noun a substance that causes another to become hard by chemical reaction
Cars & Driving
- noun a substance added (as to a paint or varnish) to harden the film
- Any of several chemicals serving to reduce wear and dusting when applied to concrete sustaining heavy traffic, such as a floor.
- The curing agent of a two-part synthetic resin, adhesive, or similar coating.
- A substance used to harden plaster casts or gelatin molds.