Definition of polycyclic in English:


Line breaks: poly|cyc¦lic
Pronunciation: /ˌpɒlɪˈsʌɪklɪk
, -ˈsɪk-/


  • 1Relating to or resulting from many cycles.
    More example sentences
    • In a screen for defective courtship songs, the nonA diss mutant was identified by its abnormal pulse songs, which become increasingly polycyclic and very high in amplitude during a song burst.
    • Interestingly, the latter's mutant song phenotype shows similarities to the wild-type songs of the D. virilis group of species, which has song pulses that are more polycyclic than those of D. melanogaster.
  • 1.1 Chemistry (Of an organic compound) having several rings of atoms in the molecule: polycyclic aromatic hydrocarbons
    More example sentences
    • The respirable portion of particulates can include acid condensates, sulfates, nitrates, and organic compounds (e.g., polycyclic aromatic hydrocarbons).
    • The molecules, called polycyclic aromatic hydrocarbons, are common in interstellar space, and many believe they were among the raw materials for life.
    • Chronic exposure to polycyclic aromatic compounds in dusts produced at the plant was suggested as a possible factor in the disease excesses.
  • 1.2 Geology (Of a landform or deposit) having undergone two or more cycles of erosion and deposition: there is evidence for polycyclic material in both samples
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    • Some structural, petrological and isotopic evidence suggests multi-stage and possibly polycyclic metamorphic evolution of the granulites of the Eastern Ghats belt.
    • Chert fragments are likely to be polycyclic but originally derived from obducted deep-sea strata.
    • The pervasively and multiply deformed polycyclic high-grade metamorphic rocks make it difficult to reconstruct the original evolutionary history of the Mozambique belt.

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