Definition of testaceous in English:
 testaceous
adjectivetɛˈsteɪʃəstɛˈsteɪʃəs
Entomology Of a dull brick-red colour.
 the ground colour is testaceous to pale rufous
 Example sentencesExamples
-  The three specimens in the UNIMAS Collection examined slightly varied in the coloration of tibiae from dark testaceous to fulvous, two specimens have a yellowish femora and darker brownish tibiae.
 -  The specimen before me has the same part of a dull testaceous color, being not at all conspicuous and in feeble contrast with the black ground color.
 
Origin
  
Mid 17th century: from Latin testaceus (from testa 'tile') + -ous.
   Definition of testaceous in US English:
 testaceous
adjectiveteˈstāSHəstɛˈsteɪʃəs
Entomology Of a dull brick-red color.
 the ground color is testaceous to pale rufous
 Example sentencesExamples
-  The three specimens in the UNIMAS Collection examined slightly varied in the coloration of tibiae from dark testaceous to fulvous, two specimens have a yellowish femora and darker brownish tibiae.
 -  The specimen before me has the same part of a dull testaceous color, being not at all conspicuous and in feeble contrast with the black ground color.
 
Origin
  
Mid 17th century: from Latin testaceus (from testa ‘tile’) + -ous.