The fratboys were throwing a wild party at their house.

Frataxin is a protein that is involved in the regulation of iron levels in cells.

There were many fraternisations at the party.

My sister has two fraternal nieces.

My brother has two fraternal nephews.

There was a fratch between the neighbors over the property boundary.

I don't want to fratch with you anymore.

The fraternal birth-order effect suggests that the more older brothers a man has, the greater the likelihood he will be gay.

She is a fraternizable person who easily makes friends with everyone.

The frateries at the university are known for their lively social events.