picein
/ˈpʌɪsɪɪn/ /ˈpɪsɪɪn/noun
1 Chemistry. A glucoside present in various trees, especially willows and conifers; p-hydroxyacetophenone-β-glucoside, CH3·CO·C6H4·O·C6H11O5.
2(Also with capital initial.) An inert thermoplastic substance composed of hydrocarbons from rubber, shellac, and bitumen, used for making joints airtight.
Origin
Late 19th century; earliest use found in Journal of the Chemical Society. From classical Latin piceus pitchy + -in.