Where does “cankerweed” come from?

cankerweed (English) comes from English canker, from Middle English canker, from Old English cancer, from Latin cancer, from Proto-Italic kankros, from Proto-Italic karkros, from Proto-Indo-European kr̥-kr̥-, from Proto-Indo-European (s)ker- — to cut, cut off, sever.

Ancestry of “cankerweed”, step by step

cankerweed traces back through two separate lines of ancestry.

via English canker

StepLanguageWordMeaning
1EnglishcankerA plant disease marked by gradual decay; A region...
2Middle Englishcanker
3Old Englishcancercancer; crab
4Latincancera crab; a tumor, cancer; a lattice, grid, or...
5Proto-Italickankroscrab
6Proto-Italickarkrosenclosure, barrier
7Proto-Indo-Europeankr̥-kr̥-circular
8Proto-Indo-European(s)ker-to cut off; to turn, bend
9Proto-Indo-Europeansek-to cut, cut off, sever

via English weed

StepLanguageWordMeaning
1EnglishweedAny plant regarded as unwanted at the place...
2Middle Englishweed
3Old Englishwēodweed
4Proto-West Germanic*weudweed (unwanted plant)
Every word from Proto-Indo-European sek-Every word from Proto-Indo-European (s)ker-Every word from Proto-Indo-European kr̥-kr̥-
cankerweed — Etymology, Origin & Word History | Etymology Explorer