(obsolete, chemistry) copper sulphate

A perennial flowering plant, Evolvulus nuttallianus, with blue petals.

(astronomy) An unusually hot and blue star in globular clusters.

A solution of indigo in concentrated sulphuric acid, used as a dye

plural of blue jay

(uncountable) Noble or aristocratic ancestry. / (countable) An aristocrat.

Of a color between blue and green; darker shades are called teal, lighter ones are cyan. / (politics) Synonym of ecocapitalist; concerning ecocapitalism

Alternative form of blue green

Any of various eucalyptus trees having blueish leaves, especially Eucalyptus globulus. / (slang, offensive) A person of sub-Saharan African origin, referring to the blue coloring around their gumline.

Being a blue-collar employee, an hourly worker.