wadset
The conveyance of land in pledge for a debt; a mortgage.
countable, obsolete, uncountable
It was at this time that Rob Roy acquired an interest by purchase, wadset, or otherwise, to the property of Craig Royston already mentioned.
Where it comes from
From Middle English wedsetten, equivalent to wed (“pledge”) + set. Wad is a Scottish form of wed.
Adapted from the Wiktionary entry wadset (CC BY-SA 4.0).