on·ci·di·um 
(ŏn-sĭdē-əm, ŏng-kĭd-)
(ŏn-sĭdē-əm, ŏng-kĭd-)n.
Any of numerous tropical American orchids of the genus Oncidium, having clusters of showy flowers.
[New Latin Oncidium, genus name : Greek onkos, barb, hook (from the shape of its labellum) + New Latin -idium, diminutive suff. (from Greek -idion).]