A Lucid Moment

So my inner etymologist had to check the plural form of vagina. Merriam-Webster lists both vaginas and vaginae as plural forms. Vagina was originally the Latin word for sheath. It seams to have been adopted into English and other languages around the 1680s as a medical/anatomical term. As far as i can tell from a quick googling, it wasn't used in Latin as an anatomical reference. The English language has adopted words from many languages and it is pretty hit and miss as to whether the foreign plural is also adopted or whether the English plural form is used. Latin and Greek words tend to have their plurals endure longer than other languages. The Latin plural of vagina is vaginae and the English plural is vaginas. My interpretation is that if you are writing in modern English and using vagina as a medical/anatomical term, then vaginas is the most appropriate plural though vaginae would not be incorrect. If you're writing something in Latin using the original definition of vagina (sheath), then the only correct plural form would be vaginae.

Personally, I prefer vaginas. And while some vegans may have vaginas, not all vaginas are vegan :P