Where does “santonin” come from?

santonin (English) comes from English in, from Middle English in, from Old English in, from Proto-West Germanic *in.

santonin (English): An anthelmintic found in santonica and related...

Definitions

santonin traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	English	in	Used to indicate location, inclusion, or position...
2	Middle English	in	Any kind of accomodation; particularly; A home or...
3	Old English	in	in; Alternative form of inn
4	Proto-West Germanic	*in	—

Step	Language	Word	Meaning
1	English	santonica	An Asian plant (Seriphidium cinum, syn. Artemisia cina), related to wormwood, which has been used since ancient times as a vermifuge due to its santonin content
2	Latin	santonica	—