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   rar·e·fac·tion

   /ˌrerəˈfakSH(ə)n/

   noun

   • 1. diminution in the density of something, especially air or a gas: "opposed processes such as rarefaction and condensation"
   • ▪ the lessening of density of tissue, especially of nervous tissue or bone: "the cord has undergone rarefaction"

   Word Origin early 17th century: from medieval Latin rarefactio(n-), from the verb rarefacere ‘grow thin, become rare’.

   Scrabble Points: 16

   • R

     1

   • A

     1

   • R

     1

   • E

     1

   • F

     4

   • A

     1

   • C

     3

   • T

     1

   • I

     1

   • O

     1

   • N

     1

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