la·teen (lə-tēn', lā-) adj. Being, relating to, or rigged with a triangular sail hung on a long yard that is attached at an angle to the top of a short mast. n.
A lateen-rigged boat.
A lateen sail.
[French (voile) latine, lateen (sail), feminine of latin, Latin (from its use in the Mediterranean), from Old French; see Latin.]