Dichromacy

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Dichromacy (from Greek di 'two' and chromo 'color') is the state of having two types of functioning photoreceptors, called cone cells, in the eyes. Organisms with dichromacy are called dichromats. Dichromats require only two primary colors to be able to represent their visible gamut.

Excerpt from the Wikipedia article “Dichromacy”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Salsero35, CC BY-SA 4.0, via Wikimedia Commons.