Etymology
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erectile (adj.)

1822, "pertaining to muscular erection," from French érectile, from Latin erect-, past participle stem of erigere "to raise or set up" (see erect (adj.)).

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Definitions of erectile

erectile (adj.)
capable of being raised to an upright position;
erectile feathers
erectile (adj.)
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
Synonyms: cavernous
From wordnet.princeton.edu