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Word of the Day Wednesday, June 10, 2026

cis

/sɪs/ noun, prefix · British & US
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What does cis mean?

noun, prefix

Cis is a prefix used in various words to indicate a relationship or position on the same side of a plane, axis, or boundary. It is often used in scientific and technical contexts.

Example

"The cis isomer of a molecule has a different structure than its trans isomer."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for cis

Antonyms of cis

Rhymes with cis

Etymologically related