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Adjective: erectile  i'rekt(u)l [N. Amer], i'rektI(u)l [Brit]
  1. Capable of being raised to an upright position
    "erectile feathers"
     
  2. Filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood
    "erectile tissue"; "the penis is an erectile organ"
    - cavernous

See also: erect, expansive, upright, vertical