ar-

prefix

Forming classification names for classes of organic compounds that contain a carbon skeleton and one or more aromatic rings.

Similar
arc-a--1
OriginLatin ad- →
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Meanings

ar-1

prefix
  1. chemistryForming classification names for classes of organic compounds that contain a carbon skeleton and one or more aromatic rings.

    ar-Tetrahydro-α-carbamidonaphthalene, C₁₁H₁₄ON₂, crystallized in square plates from alc., soften at 198° and melts at about 206° (quickly heated, at 212°).

    1919 January 10, C. J. West, abstract of G. Schroeter and K. Thomas, “Transformation of tetrahydronaphthalene (tetralin) in the animal body”; in American Chemical Society, Chemical Abstracts, Volume 13, Number 1, page 43
    2 more examples

    Potassium permanganate oxidizes ac-tetrahydronaphtylamine to o-hydrocinnam-carboxylic acid (p. 245); ar-tetrahydronaphthylamine, however, because of the oxidation of its amided benzene nucleus, is changed to adipic acid together with oxalic acid (B. 22, 767): […]

    1900, Edgar Fahs Smith (English translator), R. Anschütz (German editor), Victor von Richter's Organic Chemistry: or, Chemistry of the Carbon Compounds, Third American Edition, Volume II, P. Blakiston's Son & Co., page 393

    1-Naphthylamine is reduced by sodium and isopentanol to ar-tetrahydro-1-naphthylamine; the prefix ar- is the abbreviation of aromatic and indicates that the four hydrogen atoms are not in the ring containing the amino-group: […]

    2006, Amit Arora, Aromatic Organic Chemistry, Discovery Publishing House, published 2007, →ISBN, page 173

ar-2

prefix
  1. mathematicsUsed to form the names of inverse hyperbolic functions, and the symbols for these functions.

    Synonyms: arc-, a-, -1

ar-3

prefix
  1. alternativeAlternative form of ad- (“to, toward”).

Synonyms & antonyms

prefixUsed to form the names of inverse hyperbolic functions, and the symbols for these functions.

Similar
arc-a--1

Origin

ar- · prefix

Extracted from the word aromatic.

Full word history & related roots →

ar- · prefix

Shortened from area (because the function describes the area under a hyperbola), by analogy with arc-, the corresponding prefix for the circular trigonometric functions.

Full word history & related roots →

ar- · prefix

  1. Latinad-
  2. Englishar-

Assimilated form of ad- before r. From Latin ad-.

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Cite this entry
APA

ar-. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/ar-

MLA

“ar-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ar-. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “ar-,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/ar-.

Source: ar- on Wiktionary, CC BY-SA 4.0.