[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
Application of intumescent paint to underside of hatch on cable access level.
There are many intumescent coatings on the market for fire protection purposes.
The other countermeasure was an intumescent coating on the underbody of the
But depending on the jurisdiction, you might have to paint intumescent paint
  over it or install some kind of ignition barrier.
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