Exogen

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Exogen \Ex"o*gen\, n. [Exo- + -gen: cf. F. exog[`e]ne.] (Bot.)
     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}.
     --Gray.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:

  exogen
       n : flowering plant with two cotyledons; the stem grows by
           deposit on its outside [syn: {dicot}, {dicotyledon}, {magnoliopsid}]