Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having two or more atomic rings in a molecule.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having two or more rings of atoms in the molecule.
  • n. Such a compound

from The Century Dictionary and Cyclopedia

  • Having many rounds, turns, or whorls, as a shell.
  • In electricity, noting a system of electric distribution by alternating currents, in which the energy maxima of the flow of power of the different circuits overlap so as to give a total flow of power of constant intensity. This is the case in a symmetrical or hemisymmetrical polyphase system. See polyphase.
  • In chem., containing more than one atomic ring in the molecule.

Etymologies

Sorry, no etymologies found.

Examples

  • Sweden deserves mention, namely that certain polycyclic hydrocarbons initiating mouse tumors put a specific, antigenic mark on these, which persists despite repeated transplantation of the growths.

    Peyton Rous - Nobel Lecture

  • You mention there the possibilities for discussion of several theoretically interesting questions concerning the forces of attraction in polycyclic systems.

    Nobel Prize in Chemistry 1950 - Presentation Speech

  • The study also suggests that the substances in black tattoo inks -- materials known as polycyclic aromatic hydrocarbons PAHs -- migrate into subjects' lymph nodes, which aid an individual's body in filtering out disease-causing organisms.

    Glenn D. Braunstein, M.D.: Tattoos: Inks Raise New Health Concerns About Age-Old Designs

  • In their research, the investigators focused on a class of cancer-causing culprits found in cigarette smoke called polycyclic aromatic hydrocarbons, or PAHs.

    Smoking damages DNA within minutes, research shows

  • The oil contaminants of most health concern - potential cancer-causing substances called polycyclic aromatic hydrocarbons, or PAHs - show up in other everyday foods, too, such as grilled meat.

    Gulf Seafood Undergoes Intense Testing

  • The oil contaminants of most health concern – potential cancer-causing substances called polycyclic aromatic hydrocarbons, or PAHs – show up in other everyday foods, too, such as grilled meat.

    Gulf Seafood Gets Intense Safety Testing

  • The main issue with oil contamination is potential cancer-causing substances called polycyclic aromatic hydrocarbons, or PAHs.

    Schooling Fish Customers

  • The evaporation process can also concentrate the toxic compounds left behind, particularly oil-derived compounds called polycyclic aromatic hydrocarbons, or PAHs.

    Georgianne Nienaber: Fishing and Breathing BP's Oil: What's "Safe?"

  • Inside each backpack was an air monitor, continuously measuring levels of a type of pollutant called polycyclic aromatic hydrocarbons, or PAHs.

    Origins

  • All that processing not only diminishes taste but removes many of the heart-healthy antioxidants found in higher grades, and it can add potentially cancer-causing compounds called polycyclic aromatic hydrocarbons.

    Q&A: Is pomace olive oil bad for you?

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