Noun
An
alkaloid
(
C
<
sub
>
10
sub
>
H
<
sub
>
14
sub
>
N
<
sub
>
2
sub
>),
commonly
occurring
in
the
tobacco
plant
.
In
small
doses
it
is
a
habit-forming
stimulant
;
in
larger
doses
it
is
toxic
and
is
often
used
in
insecticides
.