dulcamara
Concise Oxford English Dictionary © 2008 Oxford University Press:
dulcamara /ˌdʌlkəˈmɛːrə/
▶noun an extract of woody nightshade, used in homeopathy.
– origin C16: from med. L., from L. dulcis ‘sweet’ + amara ‘bitter’.
'dulcamara' also found in these Oxford entries:

