English Reference

Word

phosphate

Phoneticsphos·phate

US/ˈfɑsfeɪt/

UK/fˈɒsfeɪt/

Definitions

01chemical compound

B2 · Science

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

n. 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.”

Technical

Usage

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

02fertilizer

B2 · Cooking

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

n. 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.”

Synonyms

fertilizerplant food

03soft drink

C1

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

n. 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.”

American English · Archaic

Teaching tip

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

Synonyms

04to coat or treat

C2 · Science

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

v. 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.”

Technical

Synonyms

Real-World Examples

“In Spain, the analysis reveals that although the organic pollution load has fallen, it remains high, and phosphate concentrations increased from 2015 to 2021.”
Phys.org · 28 Sept 2026
“Phosphates help the meat soak up and hold onto water while cooking – because no one likes a dry ham sandwich.”
The Conversation · 17 Aug 2026

Etymology

From French phosphate. By surface analysis, phosphoric acid + -ate (“salt or ester”).

From phosphoric acid + -ate (verb-forming suffix).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Related words

Domains

AgricultureChemistry

This entry

Level
C1 · Advanced
Frequency
Frequent
Updated

Scan code

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English Reference