Filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood. Synonym:cavernous."The penis is an erectile organ"
... veritable passion and is quite distinct from either the impulse for activity for its own sake or the desire of achievement. To shout and put forth the utmost possible strength in crude ways is erethic intoxication at a stage when every tissue can become erectile and seems, like the crying of infants, to have a legitimate function in causing tension and flushing, enlarging the caliber of blood vessels, and forcing the blood perhaps even to the point of extravasation ... — Youth: Its Education, Regimen, and Hygiene • G. Stanley Hall
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