Syzygy has always been one of my favorite words; it has such beauty of form and function. I don't know about froehold, but I did find froe in the OED - to summarize: 1. A wedge-shaped tool used for cleaving and riving staves, shingles, etc... or, Obs. form of Frow, Dutchwoman. Doesn't exactly sound related to froehold, based on the seizin definition.