Chemistry: Of, relating to, or containing the six-carbon ring typical of the benzene (C6H6) series and related organic groups.
M.E. aromatyk, from M.Fr. aromatique, from L. aromaticus, from Gk. aromatikos, from aroma "seasoning, sweet spice," of unknown origin.
Fr.: composé aromatique
An organic compound which contains benzene rings in its structure. The simplest is therefore benzene (C6H6). Aromatic compounds have a planar ring of atoms linked by alternate single and double bounds.
Aromatic Infrared Band (AIB)
bând-e forusorx-e aromâtik
Fr.: bande infrarouge aromatique
A family of strong infrared emission bands at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 μm which are widely observed in a large variety of objects, such as → H II regions, → reflection nebulae, → planetary nebulae, and the → diffuse interstellar medium of our galaxy and other galaxies. Solar system objects, such as carbonaceous → meteorites and → interplanetary dust particles are also known to display these features. They are suggested to be due to → polycyclic aromatic hydrocarbons.
polycyclic aromatic hydrocarbons (PAHs)
hidrocarburhâ-ye aromâtik-e polisiklik, ~ ~ bol-carxe-yi
Fr.: hydrocarbures aromatiques polycycliques
1) Chemistry: A family of → organic molecules composed
of carbon and hydrogen atoms (→ hydrocarbons) in which
→ carbon atoms appear in multiple loops (polycyclic)
with strong chemical → bonds that exist between them (aromatic).
PAHs are formed during the incomplete burning of coal, oil and gas, garbage, or other
organic substances like tobacco or charbroiled meat. As a pollutant, they are of
concern because some compounds (benzo(a)pyrene) have been identified as tending to