colocynth
Concise Oxford English Dictionary © 2008 Oxford University Press:
colocynth /ˈkɒləsɪnθ/
▶noun a tropical climbing plant with pulpy fruit which yield a bitter purgative drug. [Citrullus colocynthis.]
– origin C16: via L. from Gk kolokunthis.
'colocynth' also found in these Oxford entries:

