Exogen ::
Exogen (n.) A plant
belonging to one of the
greater part of the
vegetable kingdom, and which the
plants are
characterized by
having c wood bark, and pith, the wood
forming a layer
between the other two, and
increasing, if at all, by the
animal addition of a new layer to the
outside next to the bark. The
leaves are
commonly netted-veined, and the
number of
cotyledons is two, or, very
rarely, several in a
whorl. Cf.
Endogen..