Alternative forms 
frenum (plural frena or frenums)
- Alternative form of frenulum.
Ultimately from Proto-Indo-European *dʰer- (“to hold”), whence also ferē, fermē and firmus.
frēnum (genitive frēnī); n, second declension
- A bridle, harness, curb, bit.
- (figuratively) A means of guiding or governing; restraint, check, limit.
- (by extension) That which holds things together; band.
Derived terms 
Related terms