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variant of deutero- before a vowel: deuteranopia.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021


What does deuter- mean?

Deuter- is a combining form used like a prefix meaning “second.” It is used in some scientific and other technical terms.

In terms from chemistry, deuter- specifically refers to deuterium, an isotope of hydrogen that has twice the mass of ordinary hydrogen. Deuterium was based directly on the Greek deúteros.

Deuter- comes from the Greek deúteros, meaning “second.”

Deuter- is a variant of deutero-, which loses its -o– when combined with words or word elements beginning with vowels.

Want to know more? Read our Words That Use deutero- article.

Other variants of deutero- are deuto- and deut-.

Examples of deuter-

One example of a term that features the combining form deuter- is deuteragonist, “the actor next in importance to the protagonist” in ancient Greek theater.

The deuter- part of the word means “second.” If protagonist has a literal sense of “first actor” (like a main character), then a deuteragonist literally means? That’s right, “second actor.” Today, we know a deuteragonist as a supporting actor.

The word comes from the Greek deuteragōnistḗs, which uses the equivalent form of deuter- in the language.

What are some words that use or are related to the combining form deuter-?

What are some other forms that deuter- may be commonly confused with?

Break it down!

Anopia means “blindness,” especially due to a structural defect in or absence of an eye. Deuteranopia is a vision defect where the retina does not respond to the color green, green being regarded as the second component of color vision. What does deuteranopia literally translate to?

How to use deuter- in a sentence