exogen

American  

[eks-uh-juhn] / ˈɛks əˌdʒən /

noun

plural

exogens

1. Physiology. the fourth and final stage in the hair growth cycle, in which an individual hair is released from the follicle and shed before a new one grows. Compare anagen, catagen, and telogen.

2. Botany. a plant that grows by adding to the stem's outside layer, which consists of bark separated by a layer of wood from the inner layer of pith. Exogens are the same as dicotyledons. Contrasts with endogen.

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Other Word Forms

• exogenic adjective
• exogenous adjective
• exogenously adverb
• exogeny noun
• quasi-exogenous adjective

Example Sentences

Cambium, kam′bi-um, n. a layer of vascular tissue formed between the wood and the bark of exogens, in which the annual growth is formed.

From Project Gutenberg

Palms were intermediate, filling the spaces between them, but the palms stood under the exogens, growing in alcoves of the mass, rising no higher than the beginning of the branches and foliage of their lords.

From Project Gutenberg

If perfect plants, I apprehend the periodical rings, the distinctive mark of the exogens, would, by natural laws, be wanting; but, I suppose, added in the plants proceeding from the parent stem.

From Project Gutenberg

They are to be found in all exogens.

From Project Gutenberg

The follicle then re-enters the anagen phase, a new hair grows, and the old hair is pushed out, which is called exogen.

From New York Times