Sentence:  The <WSD>mastic</WSD>, of which the people of Scio gather every year an incredible quantity, is a very rich gum, made use of in medicines, which distils from a shrub called, in Latin, Lentiscus. 
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.