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[his-ti-deen, -din] /ˈhɪs tɪˌdin, -dɪn/

noun, Biochemistry.
an essential amino acid, C 3 H 3 N 2 CH 2 CH(NH 2)COOH, that is a constituent of proteins and is important as the iron-binding site in hemoglobin. Symbol: H.
Abbreviation: His;
/ˈhɪstɪˌdiːn; -dɪn/
a nonessential amino acid that occurs in most proteins: a precursor of histamine

complex amino acid, 1896, from German histidin; see histo- + chemical suffix -idine.

histidine his·ti·dine (hĭs’tĭ-dēn’, -dĭn)
Abbr. His
An amino acid that is essential for tissue growth and repair.
An amino acid that is essential for children but not for adults. Chemical formula: C6H9N3O2.


Read Also:

  • Histidine ammonia-lyase

    histidine ammonia-lyase n. An enzyme that catalyzes the deamination of histidine to urocanate. Also called histidase, histidinase.

  • Histidine decarboxylase

    histidine decarboxylase n. An enzyme that catalyzes the decarboxylation of histidine to histamine.

  • Histidinemia

    histidinemia his·ti·di·ne·mi·a (hĭs’tĭ-də-nē’mē-ə) n. A hereditary disorder characterized by an elevation of histidine levels in the blood, excretion of histidine in the urine due to deficient histidase activity, and often manifested clinically by mild mental retardation.

  • Histidinuria

    histidinuria his·ti·di·nu·ri·a (hĭs’tĭ-də-nur’ē-ə, -nyur’-) n. The excretion of excessive histidine in the urine.

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