exogen

American  

[eks-uh-juhn] / ˈɛks əˌdʒən /

noun

exogens plural

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

Derived Forms

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

Inflected Forms

Nouns

• exogens
  plural

Example Sentences

See Examples For:

exogen exogens

Professor Huxley is credited with the assertion that the primrose is "a corollifloral dicotyledonous exogen, with a monopetalous corolla and a central placenta."

From English as She is Wrote Showing Curious Ways in which the English Language may be made to Convey Ideas or obscure them. by Anonymous

The former sees a tree in all its glory, where the latter sees an exogen with a pair of cotyledons.

From The Unseen World and Other Essays by Fiske, John

It is, according to Von Martius, the Cedrela Odorata, an exogen belonging to the same order as the mahogany tree.

From The Naturalist on the River Amazons by Bates, Henry Walter

Smilax belongs to a transition class, partaking somewhat of the nature of endogen and of exogen.

From Scientific American Supplement, No. 623, December 10, 1887 by Various

Clumps of palms threw their fronds above the forest roof in some places, or a giant exogen raised a dome; but that was all.

From The Sea and the Jungle by Tomlinson, H. M. (Henry Major)

Since all the stems with which we have to deal are exogens, a particular description of that class will here be given.

From Trees of the Northern United States Their Study, Description and Determination by Apgar, A. C. (Austin Craig)

Cannot a man work in wood without knowing all about endogens and exogens, or must he attend Professor Gray's Lectures before he can be trusted to make a box-trap?

From Medical Essays, 1842-1882 by Holmes, Oliver Wendell

You must know before anybody else how the exogens are to be completely divided.

From Hortus Inclusus Messages from the Wood to the Garden, Sent in Happy Days to the Sister Ladies of the Thwaite, Coniston by Ruskin, John

They are to be found in all exogens.

From Wood and Forest by Noyes, William

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 The Sea and the Jungle by Tomlinson, H. M. (Henry Major)