azureus

Ultimately from Arabic لَازُوَرْد‎ (lāzuward, “lapis lazuli”), from Persian لاجورد‎ (lâjvard, “lapis lazuli”)

• (Classical) IPA^(key): /azˈzu.re.us/, [äz̪ˈd̪͡z̪ʊreʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /adˈd͡zu.re.us/, [äd̪ˈd̪͡z̪uːreus]

azureus (feminine azurea, neuter azureum); first/second-declension adjective

1. (Medieval Latin, New Latin) Of a deep blue colour.

• This adjective is most common as a specific epithet in botanical names. In plants, because real blue is so rare and the quality of the colour changes with time, colours which would otherwise be grouped as purple or violet are considered to be blue.

First/second-declension adjective.

Dictionary of Botanical Epithets