Plural of frenum; multiple bands or folds of tissue that restrain or attach structures in the body.
Standard English plural formation by adding -s to the Latin loanword frenum, following the convention of treating Latinized anatomical terms with English pluralization.
English loves borrowing Latin words but then just adds -s for the plural instead of using the proper Latin plural forms—so we get 'frenums' instead of 'frena,' which is linguistically lazy but very practical!
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