exogen

Century Dictionary and Cyclopedia

1. n. In botany, a plant in which the growth of the stem is in successive concentric layers. The exogens, otherwise called dicotyledons (see dicotyledon), form the larger of the two classes into which phænogamous plants are divided. They are usually considered as including two subclasses, the angiosperms and the gymnosperms, though the latter, which have essentially the same structure and mode of growth, but differ in having naked ovules, are by some late authorities separated as a distinct class. See endogen.

Wiktionary

1. n. botany A plant characterized by wood, bark and pith, the wood forming a layer between the other two, and growth only occurring on the outside.

GNU Webster's 1913

1. n. (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.

WordNet 3.0

1. n. flowering plant with two cotyledons; the stem grows by deposit on its outside