• WordNet 3.6
    • adj penial of or relating to the penis "penile erection"
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Century Dictionary and Cyclopedia
    • penial Of or pertaining to the penis: as, a penial muscle.
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In literature:

Cowper's glands are lacking; and there is a large penial bone.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various
And Jacob called the name of the place Penial: for I have seen God face to face.
"Watson Refuted" by Samuel Francis