Sentence:  Having taken upon me to order the repast, and knowing that Lord Byron, for the last two days, had done nothing towards sustenance, beyond eating a few biscuits and (to appease appetite) chewing <WSD>mastic</WSD>, I desired that we should have a good supply of, at least, two kinds of fish. 
Meaning of the word marked with <WSD> tags:  A hard, brittle, aromatic and transparent resin produced by this tree and used to make varnishes and chewing gum, and as a flavouring.