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a combining form meaning “a cut, section,” used in the formation of compound words: tomography.
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Origin of tomo-

Combining form representing Greek tómos a cut, section; cf. -tome
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023


What does tomo- mean?

Tomo- is a combining form used like a prefix meaning “a cut, section.” It is used in a few medical terms.

Tomo- comes from the Greek tómos, meaning “cut, slice.” This root, which can also mean “piece, roll of paper, or book,” is also the source of the word tome. Crack open the history of tome at our entry for the word.

Also related to tómos is atom. What’s the big idea behind atoms and cutting? Find out in our Origin section for this term.

Related to tomo- are the combining forms -ectomy, -tome, -tomy, and -tomous. Slice into their specific meanings at our Words That Use articles for the forms.

Examples of tomo-

One example of a term from medicine that features the combining form tomo- is tomography. Tomography refers to various techniques that are used to obtain an X-ray photograph of a selected plane section of the human body or some other solid object.

As we know, tomo- means “a cut, section.” The second part of the word, -graphy, denotes the process of drawing, representing, recording, imaging, or the like. Tomography has a literal sense of “getting an image of a section.”

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

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

Most words that begin with the letters tomo- do not use the combining form tomo- to denote “a cut, section.” Tomorrow is an example. Learn what the letters in tomorrow are doing today at our entry for the word.

Break it down!

The combining form gram means “drawing” or “image.” What does tomogram literally mean?

How to use tomo- in a sentence

British Dictionary definitions for tomo-

/ (ˈtɒmɒ) /

NZ a shaft formed by the action of water on limestone or volcanic rock

Word Origin for tomo

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012