殺蠹藥

mothicide

to kill / to murder / to attack / to weaken or reduce / to smart (dialect) / (used after a verb) extremely

insect that eats into books, clothing etc / moth-eaten / worm-eaten

medicine / drug / substance used for a specific purpose (e.g. poisoning, explosion, fermenting) / CL:種|种[zhong3],服[fu4],味[wei4] / to poison