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1963, John W Choate, Henry A. Thiede, University of Rochester School of Medicine and Dentistry, Transcript, Volume 2
Several feti were removed from every rats' uterus, stripped of their membranes and allowed to lie in the peritoneal cavity connected to the placenta by the umbilical cord and with the placenta still attached to the uterine wall.
The real essence of that or any other sort of substances, it is evident, we know not; and therefore are so undetermined in our nominal essences, which we make ourselves, that, if several men were to be asked concerning some oddly-shaped fœtus, as soon as born, whether it were a man or no, it is past doubt one should meet with different answers.
Usage notes
The form fetus is the primary spelling in the United States, Canada, Australia, and in the scientific community, whereas foetus is still commonly used in the United Kingdom and some other Commonwealth nations.
The nominative/accusative plural of fētus in Latin is fētūs with lengthened second vowel. The hypercorrect plurals feti and fetii are thus comparable to the hypercorrect plural octopi of octopus (the Ancient Greek plural of octopus is octopodes).
“The engine of our fate climbs the walls, teeming with armed warriors.” (The wooden horse entering Troy will soon “give birth” to the Greek soldiers hidden in its “womb.” See also: machina.)
1842, Franciscus Arv Snellman, Dissertatio Academica Excerebrationis Fetus in Partu Legem Examinatura, Helsingforsiae: Ex officina typographica Frenckelliana, page 30:
Postremo, comparatione inter excerebrationem fetus et sectionem caesaream ac partum praematurum artificialem facta, nobis apparuit, containdicatam esse excerebrationem:[…]
Finally, the comparison having been completed between the excerebration of the fetus, the caesarean section, and premature induced birth, excerebration has appeared to us to be contraindicated: