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histidine Line breaks: his|ti¦dine
Pronunciation: /ˈhɪstɪdiːn/

Definition of histidine in English:


[mass noun] Biochemistry
A basic amino acid which is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates, and is the source from which histamine is derived in the body.
Example sentences
  • The most prevalent amino acid is cysteine with other major ones including tyrosine, histidine, lysine and arginine.
  • In humans, histamine is synthesized from histidine, a conditionally-essential amino acid.
  • The amount of the amino acids threonine, proline and histidine were also increased in roots of slag-cultivated maize plants.


Late 19th century: from Greek histos 'web, tissue' + -ide + -ine4.

Definition of histidine in:

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Pronunciation: fɔːˈtɪsɪməʊ
(especially as a direction) very loud or loudly