What is "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.

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

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

Exogen has several meanings:

• an archaic term meaning a woody plant whose stem is formed by successive accretions to the outside of the wood under the bark; this group is essentially the dicots.
• a phase in the life cycle of a hair follicle in which a hair exits the follicle.
• a non-invasive ultrasound bone healing medical device, that aids in bone healing manufactured by Bioventus.