Word.ws English Dictionary

ar-

ar- prefix: forming classification names for classes of organic compounds that contain a carbon skeleton and one or more aromatic rings. Also the alternative form of ad-.

Prefix (1)

ar-

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

Prefix (2)

ar-

  1. Used to form the names of inverse hyperbolic functions, and the symbols for these functions.
    Synonyms:
    arc-, a-, -1

Also used as

ar- is also the alternative form of ad-.

Synonyms of ar-

Origin of ar-

Extracted from the word aromatic.

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

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

Words formed from ar-

Questions about ar-

What does ar- mean?
Ar- means forming classification names for classes of organic compounds that contain a carbon skeleton and one or more aromatic rings.
What part of speech is ar-?
Ar- is a prefix.

Words near ar- in the dictionary

  1. Ar Rayyan
  2. AR theory
  3. ar'
  4. ar'n't
  5. Ar(l)
  6. ar-
  7. AR-15
  8. AR-15s
  9. Ar-arusip
  10. ar-Raqqa
  11. Ar-Raqqah

Source and license

Adapted from Wiktionary: ar- (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “ar-.” Word.ws, https://word.ws/ar-. Based on Wiktionary, CC BY-SA 4.0.