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Adjective: imparipinnate  im,per-u'pi,neyt [N. Amer], im,pa-ru'pi,neyt [Brit]
  1. (a leaf shape) pinnate with a single leaflet at the apex
    "The imparipinnate leaves of the ash tree had a distinctive terminal leaflet";
    - odd-pinnate

See also: compound

Encyclopedia: Imparipinnate