A commodity with a wide range of uses, including making jellies, clarifying liquors, manufacturing glue. It is a firm whitish substance obtained from the air bladder of certain fish such as the sturgeon.
A spelling of ‘jettison’, used of goods thrown overboard from a ship in distress. The word appears to have been used in York for the compensation paid to merchants in such cases.
Examples in the OED date from 1516 and the meaning given is ‘a pier or supporter of a wooden bridge’: Marshall defined it in 1788 as ‘the starling of a wooden bridge’.
A bent piece of iron, inserted to strengthen a joint (OED). The following much earlier references are in a sequence in which the jointers are used in pairs, for cupboards and windows, linked with hasps, staples, and bands.