Translation of "Intra" in English

Il prétend se rappeler parfaitement sa vie intra-utérine !

He claims he can remember his time in the womb perfectly.

C'est un mélange entre un match de hockey intra-muros et un concert.

It's kind of a hybrid between an intramural hockey game and a concert.

Les conflits inter-familiaux ont davantage de chances de devenir violents que les conflits intra-familiaux. Ou est-ce bien le cas ?

Inter-family is more likely than intra-family conflict to result in violence. Or is it?