Definition of testaceous in English:

testaceous

adjective

Biology
  • Of a dull brick-red colour:

    ‘the ground colour is testaceous to pale rufous’
    • ‘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.’
    • ‘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.’

Origin

Mid 17th century: from Latin testaceus (from testa tile) + -ous.

Pronunciation:

testaceous

/tɛˈsteɪʃəs/