lateen sail
Concise Oxford English Dictionary © 2008 Oxford University Press:
lateen sail /laˈtiːn/
▶noun a triangular sail on a long yard at an angle of 45° to the mast.
– origin C16: from Fr. (voile) Latine ‘Latin (sail)’, so named because it was common in the Mediterranean.
'lateen sail' also found in these Oxford entries:

