# phosphate

/ˈfɑsfeɪt/ (US) · /fˈɒsfeɪt/ (UK)

Source: https://englishreference.com/word/phosphate
Updated: 2026-08-08

## Senses

### 1. chemical compound

noun · CEFR B2 · Technical

a chemical salt or liquid made from phosphoric acid, found in rocks and living things.

For teachers: any salt or ester of phosphoric acid, occurring naturally in minerals and as a vital component of biological molecules like DNA.

- The scientist measured the level of phosphate in the water sample.
- High concentrations of dissolved phosphate in the lake were attributed to industrial runoff from the nearby processing plant.

Usage: Often used in the plural when referring to different chemical types.

### 2. fertilizer

noun · CEFR B2

a substance added to soil to help crops and plants grow better.

For teachers: any fertilizer containing phosphate compounds, used to stimulate root development and flowering in agriculture.

- Farmers use phosphate to make sure their corn grows strong.
- The agricultural cooperative ordered several tons of rock phosphate to prepare the fields for the spring planting season.

### 3. soft drink

noun · CEFR C1 · American English · Archaic

a type of fizzy, flavored drink that was popular in the past.

For teachers: a carbonated soft drink containing a small amount of phosphoric acid, typically flavored with fruit syrup.

- The old shop still serves a cherry phosphate at the soda fountain.
- The menu at the vintage diner featured a variety of phosphates, a nostalgic nod to early twentieth-century American beverage culture.

Teaching tip: This sense is mostly found in historical contexts or specialized vintage-style cafes in the United States.

### 4. to coat or treat

verb · CEFR C2 · Technical

to cover a surface, like metal, with a chemical layer to protect it.

For teachers: to treat or coat a surface with a phosphate or phosphoric acid, usually to provide corrosion resistance.

- The factory must phosphate the steel parts to prevent them from rusting.
- The automotive components are phosphated prior to painting to ensure maximum adhesion and long-term durability against environmental wear.

## Examples

- Farmers use phosphate to help their crops grow faster.
- The local river showed high levels of phosphate runoff from the nearby industrial farms.
- Excessive phosphate levels in aquatic ecosystems can lead to eutrophication, where rapid algae growth depletes oxygen and threatens the survival of fish populations.

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