expansion

1. An increase in size as of chest or lungs. 2. The spreading out of any structure, as a tendon. 3. An expanse; a wide area. [L. ex-pando, pp. -pansus, to spread out]
- clonal e. (klo′nal) production of daughter cells all arising originally from a single cell.
- extensor e. SYN: extensor digital e..
- extensor digital e. a triangular tendinous aponeurosis including the tendon of the extensor digitorum centrally, interosseus tendons on each side, and a lumbrical tendon laterally. It covers the dorsal aspect of the metacarpophalangeal joint and the proximal phalanx. SYN: dorsal hood, extensor aponeurosis, extensor e..
- hygroscopic e. 1. e. due to the absorption of moisture; 2. in dental casting, the addition of water to the surface of the casting investment during setting to increase the size of the mold.
- perceptual e. development of an ability to recognize and interpret sensory stimuli through associations with past similar stimuli; perceptual e. by relaxation of defenses is a goal of psychotherapy.
- setting e. the dimensional increase that occurs concurrently with the hardening of various materials, such as plaster of Paris.
- wax e. in dentistry, a method of expanding wax patterns to compensate for the shrinkage of gold during the casting process.

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ex·pan·sion ik-'span-chən n
1) the act or process of expanding
2) the quality or state of being expanded

* * *

ex·pan·sion (ek-spanґshən) [L. expandere to spread out] 1. the process or state of being increased in extent, surface, or bulk. 2. a region or area of increased bulk or surface. 3. abnormal, excessive occurrence of a triplet repeat.

Medical dictionary. 2011.

Synonyms:

Look at other dictionaries:

  • Expansion — Ex*pan sion, n. [L. expansio: cf. F. expansion.] 1. The act of expanding or spreading out; the condition of being expanded; dilation; enlargement. [1913 Webster] 2. That which is expanded; expanse; extend surface; as, the expansion of a sheet or… …   The Collaborative International Dictionary of English

  • Expansion — may refer to: *In physics: ::*expansion of space, ::*thermal expansion, ::*expansion fan. *In computer hardware: an expansion card *In computer programming: JEE5 developing tool in line expansion *In engineering expansion is the increase in the… …   Wikipedia

  • Expansion — steht für: Expansion des Universums Expansion von Staaten, eine Erweiterung des Staatsgebiets zu Lasten der Nachbarn oder durch Kolonisation (vgl. Europäische Expansion) Expansion (Wirtschaft), das Wachstum im wirtschaftlichen Bereich die… …   Deutsch Wikipedia

  • Expansión — is a Spanish economic newspaper published by Unidad Editorial.External links* [http://www.expansion.com Expansión web site] …   Wikipedia

  • Expansión — Pays  Espagne Langue Espagnol Périodicité Quotidien Genre Presse économique Éditeur Madrid …   Wikipédia en Français

  • Expansion — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Le terme d expansion peut se référer: En cosmologie, à l expansion de l univers, le phénomène d éloigne des galaxies distantes les unes des autres. Le… …   Wikipédia en Français

  • EXPANSION — s. f. Action ou état d un corps fluide qui se dilate. L expansion de l air par la chaleur. Fig., Avoir de l expansion, Communiquer facilement ses sentiments. EXPANSION, en termes d Anatomie, se dit Du prolongement de quelque partie. Expansion… …   Dictionnaire de l'Academie Francaise, 7eme edition (1835)

  • expansion — noun Date: 1611 1. expanse 2. the act or process of expanding < territorial expansion > < economic expansion > < expansion of the universe > 3. the quality or state of being expanded 4. the increase in volume of working fluid (as steam) in an… …   New Collegiate Dictionary

  • EXPANSION — n. f. Action ou état d’un corps fluide qui se dilate. L’expansion de l’air par la chaleur. En termes d’Anatomie, il se dit du Prolongement de quelque partie. Expansion membraneuse. Expansion ligamenteuse. Figurément il se dit de l’Action par… …   Dictionnaire de l'Academie Francaise, 8eme edition (1935)

  • Expansion De L'univers — Pour les articles homonymes, voir Expansion. L expansion de l Univers imagée par le gonflement d un cake aux raisins. En c …   Wikipédia en Français

  • Expansion coupling — Expansion Ex*pan sion, n. [L. expansio: cf. F. expansion.] 1. The act of expanding or spreading out; the condition of being expanded; dilation; enlargement. [1913 Webster] 2. That which is expanded; expanse; extend surface; as, the expansion of a …   The Collaborative International Dictionary of English

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