Useful english dictionary. 2012.
three — RG. 371; [thrinne]. HD. 716 … Oldest English Words
thryn — var. thrinne Obs., three fold … Useful english dictionary
thrynne — thrynne, þrynne var. thereinne Obs., thrinne Obs … Useful english dictionary
þrynne — thrynne, þrynne var. thereinne Obs., thrinne Obs … Useful english dictionary