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I'm reading a breast feeding polemic at the moment and she uses 'formulas', suggesting in one footnote that using 'formulae' is an insidious way evil formula companies imply their product is scientifically superior to breast milk.
The only time I've seen 'formular' is on this thread! Saying formulae when referring to baby milks does sound wrong despite it being correct, I'd have used formulas and possibly been responsible for a dog being attacked by a flying iPhone