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exogen n. 外長植物;雙子葉植物 外長植物;雙子葉植物 exogen n 1: flowering plant with two cotyledons; the stem grows by deposit on its outside [synonym: {dicot}, {dicotyledon}, {magnoliopsid}, {exogen}] 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]
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