Definition of longward in US English:

longward

adjective

Astronomy
  • Directed or occurring towards longer wavelengths; situated or occurring at longer wavelengths in a spectrum.

adverb

Astronomy
  • Towards longer wavelengths; on the long-wavelength side of.

Origin

1940s; earliest use found in Astrophysical Journal. From long + -ward.

Pronunciation

longward

/ˈlɒŋwəd/