of a deep shade of green; olive.

1770–80; < Neo-Latin olīvāceus, equivalent to Latin olīv(a) olive + -āceus -aceous

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World English Dictionary
olivaceous (ˌɒlɪˈveɪʃəs)
of an olive colour

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Adults tawny to gray or olivaceous dorsally, lighter ventrally.
Adults gray to olivaceous dorsally, white ventrally.
In some situations, the species may appear much darker and olivaceous on the
  dorsal surface.
Head sharply bi-colored, light below, olivaceous above.
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