What does arseniate mean?
"Arseniate" is a technical term for a salt or ester derived from arsenic acid — a compound containing the arsenate ion or group. It appears most often in older chemistry and mineralogy texts, where minerals such as copper, iron, or lead arseniates were described and classified; in contemporary scientific usage it has been almost entirely displaced by the standard term "arsenate." Because arsenic compounds are toxic, arseniates carry strong associations with poison and industrial hazard, and they figured prominently in nineteenth-century discussions of arsenical pigments, pesticides, and contaminated wallpaper. The word also exists in a rare verbal sense, "to combine or treat with arsenic acid," though this usage is likewise obsolete. For general readers today, "arseniate" is best understood as a historical variant: encountering it signals older scientific writing rather than current practice. Its enduring interest lies partly in etymology — it descends from the Latin "arsenicum" and ultimately Greek "arsenikon," the name of the yellow pigment orpiment.
nounA salt or ester of arsenic acid; a compound containing the arsenate ion or group. The term is now largely superseded in modern chemistry by 'arsenate'.
- A salt or ester of arsenic acid, containing the arsenate group; now more commonly called an arsenate.
"The mineralogist identified the specimen as a copper arseniate."
"The ore was found to contain a natural calcium arseniate."
"Early chemical treatises classified each metallic arseniate by its crystalline form."
Regular plural, used when referring to multiple such compounds or minerals.
"The museum's collection included numerous arseniates from Cornish mines."
Before chemists settled on 'arsenate', Victorian textbooks spoke of 'arseniates' — the same notorious arsenic compounds that coloured wallpapers and poisoned the 19th century.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of arseniate
"Arseniate" was formed from "arsenic," borrowed via Latin "arsenicum" from Greek "arsenikon," which denoted orpiment, a yellow arsenic sulphide pigment (the Greek word may itself derive from Arabic "al-zarnīkh"). The suffix "-ate" marks salts of acids in chemical nomenclature. The term arose during the development of systematic chemistry in the late eighteenth and early nineteenth centuries and has since given way to "arsenate." Related words sharing this root include "arsenical," "arsenious," and "arsenite."
Related word forms
How arseniate is actually used
A chiefly technical, historical term found in older chemistry and mineralogy literature; modern scientific writing uses 'arsenate' instead.
Easily confused with arseniate
'Arsenate' is the standard modern term for a salt of arsenic acid, while 'arseniate' is an older or less common variant referring to the same class of compounds.
An arsenite is a salt of arsenious acid (containing As(III)), whereas an arseniate/arsenate derives from arsenic acid and contains arsenic in the +5 oxidation state.