Þrinen

According to the Old English Dictionary:

þrinen

adj. Threefold; trinus :-- God ánfeald and samod þrynen (trinus), Hymn. Surt. 105, 3. God þrynen and án, 115, 37: 137, 31. Þrynenum gebede trina oratione ... Mid þrynum tódále trina partitione, Anglia xiii. 380, 214, 217. God ðæne ðrynenne on ánnesse and ǽnne on ðrynnesse wé andettaþ Deus quem trinum in unitate et unum in trinitate confitemur, Waal. Cat. 292, col. 1. [Cf. Icel. þrinnr.] þrinen