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Adjective: erectile  i'rek-t(u)l or i'rek,tI(-u)l [N. Amer], i'rek,tI(-u)l [Brit]
  1. Capable of being raised to an upright position
    "erectile feathers"
  2. (physiology) filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood
    "the penis is an erectile organ"; "erectile tissue";
    - cavernous

See also: erect, expansive, upright, vertical

Encyclopedia: Erectile