Definition of phthalo in US English:

phthalo

noun

  • 1In full "phthalo blue": = phthalocyanine blue.

  • 2In full "phthalo green": = phthalocyanine green.

Origin

1960s. Shortened from phthalocyanine.

Pronunciation

phthalo

/ˈ(f)θaləʊ/