Plural form of foetus (British spelling), referring to multiple unborn babies or fetuses.
From Latin 'foetus' with the Latin plural '-i' ending preserved in English medical and formal writing. While modern English typically uses 'fetuses,' 'foeti' maintains the original Latin pluralization.
This is one of those words that shows English's inconsistent relationship with Latin—we mostly say 'fetuses' now, but medical professionals might still use 'foeti' to sound more learned or formal, just like 'octopi' instead of 'octopuses.'
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