I see no one has picked up on my correction of the misspelling: it's
Trifid, not Trifed.

That's correct, and it's an actual word in English, too. The American
pronunciation is "try-fid" (long i, then short i) with more emphasis
on the first syllable.

- Robert Cook

I'd always said TRIH-fid to myself, but TRY-fid makes more sense if maybe it
refers to a partition into three.

?