intumescence

[in-too-mes-uhns, -tyoo-]
noun
1.
a swelling up, as with congestion.
2.
the state of being swollen.
3.
a swollen mass.

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

intumescent, adjective
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World English Dictionary
intumescence or intumescency (ˌɪntjʊˈmɛsəns)
 
n
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
 
n
 
intumescent or intumescency
 
adj

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American Heritage
Medical Dictionary

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

  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
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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
  vehicle.
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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