deemster
A judge; one who pronounces sentence or doom.
If you hire a house for a year, and before the end of a month, happen to disagree with your landlord, he goes to the Deemster, and tells him, that he suspects you intend to leave the island, without paying his rent; […]
Where it comes from
From Middle English demester, demster, equivalent to deem (“to judge”) + -ster.
Adapted from the Wiktionary entry deemster (CC BY-SA 4.0).