noun · 2 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ˈsaɪ.tə(ʊ)(ˌ)kaɪn/
General-American:/ˈsaɪ.təˌkaɪn/
General-American:[ˈsaɪ.ɾəˌkaɪn]
Southern-England:Recorded audio is listed in the source snapshot.
1
noun
Meaning 1
Any of various small regulatory proteins that regulate the cells of the immune system.
Definition source: English Wiktionary via Wiktextract