What does citrate mean?
Citrate is a term from chemistry referring to any salt or ester of citric acid, the weak organic acid that gives lemons and limes their sharp taste. When citric acid loses its acidic hydrogen ions, they can be replaced by metal ions such as sodium, potassium, or calcium, producing familiar compounds like sodium citrate and calcium citrate. These appear widely in everyday life, from food preservatives and flavourings to calcium supplements and antacids. Citrate also plays a vital role in medicine: it binds calcium in blood, which prevents clotting, so citrates are standard anticoagulants in stored blood products. As a verb, chiefly in medical settings, 'to citrate' means to treat something, usually blood, with such a salt. Though technical in register, citrate is worth knowing because it links the chemistry of citrus fruit to practical uses in nutrition, food processing, and life-saving medical care.
Any salt or ester of citric acid, in which one or more of the acid's carboxyl hydrogen atoms are replaced by metal ions or organic groups.
"Potassium citrate is commonly prescribed to help prevent certain types of kidney stones."
In chemistry, specific compounds are named with a cation first, as in sodium citrate or ferric ammonium citrate.
To treat a substance, especially blood, with a citrate so as to prevent coagulation.
"The blood bank citrates each unit before storage."
This sense is confined mainly to medical and laboratory usage.
The plural refers to different kinds of citrate salts or esters rather than countable instances; in general discussion citrate is treated as an uncountable substance.
"Various citrates are used as acidity regulators in soft drinks."
Every time you donate blood, a citrate is quietly at work keeping your sample liquid — without it, modern transfusion medicine would be nearly impossible.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of citrate
Citrate derives from 'citric', itself formed on the Latin noun citrus, meaning the citron tree, whose sour fruit gave English both 'citron' and 'citrus'. The term arose in the scientific vocabulary of the eighteenth century as chemists began naming salts after their parent acids, so citrate simply means 'a compound of citric acid'. Its cognates include 'citrus' and 'citric', all ultimately tracing back to that same Latin root for the citron tree.
Related word forms
How citrate is actually used
Citrate is overwhelmingly a technical word used in chemistry, medicine, pharmacology, and food science; it rarely appears in casual conversation. The verb sense is restricted almost entirely to medical and laboratory contexts, especially blood banking.
Easily confused with citrate
Nitrate is a salt of nitric acid containing NO3−, whereas citrate is a salt or ester of citric acid, derived from citrus fruits.