[in-too-mes-uhns, -tyoo-]
a swelling up, as with congestion.
the state of being swollen.
a swollen mass.

1650–60; < French; see intumesce, -ence

intumescent, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intumescence or intumescency (ˌɪntjʊˈmɛsəns)
1.  pathol a swelling up, as with blood or other fluid
2.  pathol a swollen organ or part
3.  chem the swelling of certain substances on heating, often accompanied by the escape of water vapour
intumescency or intumescency
intumescent or intumescency

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

intumescence in·tu·mes·cence (ĭn'tōō-měs'əns, -tyōō-)

  1. The act or process of swelling or the condition of being swollen.

  2. A swollen organ or body part.

in'tu·mes'cent adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
There have been attempts to develop abetter understanding of intumescence.
Other chemical effects also may be achieved, such as film-forming and intumescence.
In this study, two approaches to defining intumescence were examined.
The hydrated borate crystals are subject to intumescence, that is, swelling on rapid or severe heating.
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