tube·rose 1 
(tbrōz′, tyb-, tbə-)
(tbrōz′, tyb-, tbə-)n.
A tuberous perennial Mexican plant (Polianthes tuberosa) having grasslike leaves and cultivated for its highly fragrant white flowers, which yield an essential oil formerly used in perfumery.
[From New Latin tūberōsa, species name, from feminine of Latin tūberōsus, full of lumps, from tūber, lump; see TUBER.]