spinnaker
Concise Oxford English Dictionary © 2008 Oxford University Press:
spinnaker /ˈspɪnəkə/
▶noun a large three-cornered sail set forward of the mainsail of a racing yacht when running before the wind.
– origin C19: appar. formed from Sphinx, the name of the yacht first using it, perh. influenced by spanker.
'spinnaker' also found in these Oxford entries:

