| Answer | Crossword Clue |
|---|---|
| pyrophoric | capable of igniting spontaneously in air. |
| pyrophorus | any substance capable of igniting spontaneously on exposure to air |
| pyrophoruses | PYROPHORUS, any substance capable of igniting spontaneously on exposure to air |
| pyrophoric | spontaneously igniting in air also PYROPHOROUS |
| pyrophorous | spontaneously igniting in air also PYROPHORIC |
| phosphorus | The chemical element of atomic number 15, a poisonous, combustible nonmetal that exists in two common allotropic forms, white phosphorus, a yellowish waxy solid that ignites spontaneously in air and glows in the dark, and red phosphorus, a less reactive form used in making matches |
