English
fleabane
From flea + bane.
Proto-Germanic *banô ‘killer, murderer, slayer’
Proto-West Germanic *banō
Old English bana ‘person or thing that causes death, murderer’
Middle English bane ‘person or thing that destroys life, murderer,…’
English bane
Today it means
noun Any of various species of flowering plants in certain genera in family Asteraceae, that typically repel insects: mostly in two tribes of subfamily Asteroideae
Language periods are conventional ranges, not dates for this word.
Etymograph / fleabane