| Rating | Solver | Clue |
|---|---|---|
| INURES | Hardens | |
| TOUGHENS | Hardens | |
| STIFFENS | Hardens | |
| SETS | Hardens | |
| TEMPERS | Hardens | |
| HARDENER | One who, or that which, hardens; specif., one who tempers tools. | |
| HARDENING | That which hardens, as a material used for converting the surface of iron into steel. | |
| HARDEN | To become hard or harder; to acquire solidity, or more compactness; as, mortar hardens by drying. | |
| POZZOLANA | Volcanic ashes from Pozzuoli, in Italy, used in the manufacture of a kind of mortar which hardens under water. | |
| SPIN | ... threads produced by the extrusion of a viscid, transparent liquid, which hardens on coming into contact with the air; -- said of the spider, th... | |
| PORTLAND CEMENT | ...s. It contains a large proportion of clay, and hardens under water. ... | |
| GUM | A vegetable secretion of many trees or plants that hardens when it exudes, but is soluble in water; as, gum arabic; gum tragacanth; the gum of ... | |
| GRAPHOTYPE | ...ign is drawn upon this in a peculiar ink which hardens the surface wherever it is applied. The surface is then carefully rubbed or brushed, leav... | |