What does dichromic mean?
Dichromic is an adjective describing something that involves or displays two colors. It appears most often in scientific and technical contexts: a dichromic substance may appear one color when light passes through it in one direction and another color when the light is polarized differently, a property studied in optics and crystallography. Beyond the laboratory, the word can describe any two-colored object — a dichromic fabric, print, or design — though in casual use speakers usually prefer everyday alternatives such as "two-toned." The word derives from Greek roots meaning "two" and "color," placing it in a family with terms like monochrome and polychrome. It should not be confused with "dichroic," which is the more specialized optical term, nor with "dichromatic," which commonly describes two-color vision. For readers interested in precise description of light, color, and material, dichromic offers a compact and evocative option.
Having or involving two colors.
"The butterfly's dichromic wings flashed blue on top and green underneath."
In general usage, near-synonyms such as bicolored are more common.
(Of an optical material) Exhibiting two different colors according to the polarization or direction of light passing through it.
"Pleochroic minerals often show strongly dichromic behavior in thin section under polarized light."
Hold a dichromic crystal up to polarized light and it plays a trick on your eyes — the same stone shows two entirely different colors at once.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dichromic
Dichromic comes from the Greek roots di-, meaning "two," and chroma, meaning "color," combined with the adjectival suffix -ic. It entered English through scientific Latin formation alongside related terms such as dichromatic and dichroism, emerging in the vocabulary of nineteenth-century optics and chemistry, where scientists needed precise words for substances displaying two colors. Its cognates share the chroma root: chromatic, polychrome, and monochrome all trace back to the same Greek noun for color.
How dichromic is actually used
A relatively technical word, most at home in scientific writing about optics, mineralogy, and photography. In everyday contexts, simpler terms like "two-toned" or "bicolored" are more common. Note that "dichroic" is often preferred in optics literature.
Easily confused with dichromic
"Dichroic" is the standard term in optics for a material showing two colors by transmitted or reflected light, while "dichromic" is the broader adjective simply meaning having or relating to two colors.
"Dichromatic" typically describes vision or images involving two colors (as in dichromatic vision in animals), whereas "dichromic" more often describes objects, filters, or substances displaying two colors.