I found a near word "vena" whose meaning is (vena, -ae : vein, blood vessel / the urinary passage / man's sexual organ / the strength)in illo ipso uoluptatis ultimae aestu quo genitale uinis expellitur
Since this passage is about sex, this word is very probable. For, with "venis" instead of "vinis" you can translate as
in that very excitement of pleasure in which the semen is ejaculated with strengths (or, from the urinary passsages!)
(I translate the "genitale" as "semen", though according to L&S it means "the sexual organ".)
Someone please confirm my guess, or give me a good information.
VOCABULARY LIST
+ voluptas : satisfaction, enjoyment, pleasure, delight (whether sensual or spiritual) / the desire for pleasure / male semen
+ ultimus : being farthest, the farthest, most distant, most remot,
/ (of Time or Order of sequence) the last, latest, final ; the earliest,
/ (of Degree or Rank) the utmost, extreme, highest, first, greatest ; the lowest, meanest, most base^^^^^ultimae perfectaeque (the utmost and perfect ......)^^^^ut absit ab ultimis vitiis (that he may abstain from extreme vices)^^^^ultimae causae cur perirent (the utmost reasons why they were going to ruin)^^^^scelus (the extreme misfortune or the extreme crime)^^^^ad ultimum periculum venit (he came into the utmost calamity)^^^^dedecus (extreme ugliness)^^^^inopia (extreme want or poverty)^^^^desperatio (utmost desperation)
+ aestus, -us (m.) : violent commotion (of raging fire, of the tossing, surging motion of the sea) / heat ^^^^permiscet frigus et aestum (it mixes the coldness and the heat)^^^^multa aestu victa (many were beaten by the heat)^^^^labore et aestu languidus (weary of labor and heat) / heat of disease, fever, wound, inflammation^^^^ulceris aestus (heat in the ulcer)^^^homines aegri cum aestu febrique jactantur (sich persons are disturbed with heat and fever)
/ the passionate ferment or commotion or excitement of mind, the ardor of any (bad or good) passion^^^^civilis belli aestus (a fever among citizens for war)^^^^aestus gloriae (passion for glory)^^^^pectoris adjuvet aestum (let him keep his ardant passion of love in the heart)^^^^repente te quasi quidam aestus ingenii tui procul a terra abripuit (suddenly an excitement of your poetic mind snached you far away from the earth, so as to say)
+ genitalis : of or belonging to generation or birth, causing generation or birth, fruitful, generative, genital ^^^^genitales partes corporis (genital parts)^^^^genitalia membra (genital parts of the body)^^^genitale semen (semen)
/ genitale (n.) : = genitale membrum (genital part of the body)
+ vinis : ? (vinum : wine) (vena, -ae : vein, blood vessel / the urinary passage / man's sexual organ / the strength)
+ expellere : to drive out or away, thrust out or away, eject, expel ^^^^sagittam acru (shoot the arrow from the bow)^^^^^expulsuri tela nervos retro tendimus (we pull back the string of the bow to shoot the arrow)^^^^^patria (from the mother-land)^^^(from the city)^^^(from the shore to the land)^^^(into exile)^^^(one's wife = divorce)^^^(from life = kill)^^^^(from danger = save, deliver)^^^(laziness from the mind)^^^(anxiety from the heart)^^^(the guilty's soul = kill)^^^(disease)^^^(sleep from the eye)^^^(the doubt from the mind)^^^sententia expulsa (with the sentence being rejected)