pi·no·syl·vin | \ ˌpīnōˈsilvə̇n \
Definition of pinosylvin
: a toxic phenolic compound C6H5CH=CHC6H3(OH)2 related to stilbene that is found in the heartwood of Scotch pine and that gives protection to the wood against fungi, insects, and chemicals (as calcium bisulfite); 5-styryl-resorcinol
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