Definition of blue-green in US English:

blue-green

noun

  • 1A colour intermediate between blue and green; a pigment of this colour.

  • 2Blue-green alga. Usually in plural.

adjective

  • Of a colour intermediate between blue and green.

Origin

Mid 17th century; earliest use found in John Sparrow (1615–1670), translator and lawyer. From blue + green.

Pronunciation

blue-green

/ˌbluːˈɡriːn/