phosphate

noun

phos·​phate ˈfäs-ˌfāt 

1

a(1)

: a salt or ester of a phosphoric acid

(2)

: the trivalent anion PO₄³⁻ derived from phosphoric acid H₃PO₄

b

: an organic compound of phosphoric acid in which the acid group is bound to nitrogen or a carboxyl group in a way that permits useful energy to be released (as in metabolism)

2

: an effervescent drink of carbonated water with a small amount of phosphoric acid flavored with fruit syrup

3

: a phosphatic material used for fertilizers

Examples of phosphate in a Sentence

Recent Examples on the Web

Iron ore, gold, potash, and phosphates are the minerals whose value are the largest contributors to Africa’s undeveloped endowment. —Alexander Onukwue, semafor.com, 20 Feb. 2026

Launched in 2019, the festival also taps into the ecological challenges facing the Mediterranean port city of Gabès in Southern Tunisia, linked to an aging chemical factory producing phosphate fertilizers, as a hub for thinking about a different future for the city and its local population. —Melanie Goodfellow, Deadline, 17 Feb. 2026

Power is supplied by a 12-volt, 10-amp-hour lithium iron phosphate (LiFePO₄) battery, selected for its thermal stability, safety characteristics, and long cycle life. —Jijo Malayil, Interesting Engineering, 10 Feb. 2026

My research—including an interview with a poultry science professor—led me to the conclusion that sodium phosphate, commonly used to make chickens extra juicy, could be a credible culprit for the soapy profile. —Li Goldstein, Bon Appetit Magazine, 6 Feb. 2026

Word History

Etymology

French, from acide phosphorique phosphoric acid

First Known Use

1788, in the meaning defined at sense 1a(1)

Phrases Containing phosphate

• ammonium phosphate
• calcium phosphate
• creatine phosphate
• diammonium phosphate
• disodium phosphate
• glucose phosphate
• glucose-6-phosphate dehydrogenase
• nicotinamide adenine dinucleotide phosphate
• phosphate rock
• trisodium phosphate

Rhymes for phosphate

• bisphosphate
• diphosphate
• triphosphate
• glycerophosphate
• organophosphate
• metaphosphate
• monophosphate
• orthophosphate
• polyphosphate
• pyrophosphate
• superphosphate

Kids Definition

phosphate

noun

phos·​phate ˈfäs-ˌfāt 

1

: a salt of a phosphoric acid

2

: a drink made of carbonated water and fruit syrup with a little phosphoric acid added for tang

Medical Definition

phosphate

noun

phos·​phate ˈfäs-ˌfāt 

1

a

: a salt or ester of a phosphoric acid

b

: the trivalent anion PO₄³⁻ derived from phosphoric acid H₃PO₄

2

: an organic compound of phosphoric acid in which the acid group is bound to nitrogen or a carboxyl group in a way that permits useful energy to be released (as in metabolism)