phosphorus
n. uncountablen. a chemical element that is very reactive and glows in the dark. It is essential for life and is found in things like bones, DNA, and matches.
n. a highly reactive non-metallic element with the atomic number 15. In its white form, it is poisonous and spontaneously ignites in air; in its red form, it is used in the manufacture of safety matches.
Phosphorus is an essential mineral for healthy bones.
Farmers often add phosphorus to their soil because it helps crops grow strong roots and produce fruit.
The excessive runoff of phosphorus from agricultural fertilizers into local waterways can lead to harmful algal blooms that deplete oxygen levels and kill aquatic life.
From Latinised Greek Phosphorus, from Ancient Greek Φωσφόρος (Phōsphóros, “the bearer of light”), from φῶς (phôs, “light”) + φέρω (phérō, “I bear, carry”).
Usually uncountable when referring to the chemical element; can be countable when referring to specific isotopes or chemical varieties.