təˈbækəu n. (pl. -os) 1 (in full tobacco-plant)
any plant of
the genus Nicotiana, of
American origin,
with narcotic leaves used
for smoking, chewing, or
snuff. 2
its leaves,
esp. as prepared for smoking. øtobacco
mosaic virus a virus
that causes mosaic
disease in tobacco,
much used in biochemical
research. tobacco-pipe see
PIPE n. 2. tobacco-stopper an
instrument for
pressing down the tobacco in a pipe. [Sp. tabaco, of Amer. Ind. orig.]