EXOGEN

dicot, dicotyledon, magnoliopsid, exogen

(noun) flowering plant with two cotyledons; the stem grows by deposit on its outside

Source: WordNet® 3.1

Etymology

Noun

exogen (plural exogens)

(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.

Source: Wiktionary

Ex"o*gen, n. Etym: [Exo- + -gen: cf. F. exogène.] (Bot.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition