tritanopia

n.
A visual defect characterized by the inability to discern blue and yellow.

[Greek tritos, third + Greek anōpiā, blindness (an-, not; see a-¹ + -ōpiā, -opia), so called because blue is considered the third of the primary colors.]

(trī'tə-nō'pē-ə)
n.

A deficiency in color preception characterized by an inability to discern blue and yellow due to an absence of blue-sensitive pigment in the retina.

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The noun has one meaning:

Meaning #1: rare form of dichromacy characterized by a lowered sensitivity to blue light resulting in an inability to distinguish blue and yellow
  Synonym: blue-blindness

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