noun · 3 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:/ˈkeɪ.siːn/
Received-Pronunciation:/ˈkeɪ.siː.ɪn/
General-American:/ˈkeɪ.sin/
General-American:/keɪˈsin/
General-American:/ˈkeɪ.si.ɪn/
Southern-England:Recorded audio is listed in the source snapshot.
US:Recorded audio is listed in the source snapshot.
rhymes with -eɪsiːn
rhymes with -iːn
CMU ARPABET:K EY0 S IY1 N
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
A protein present in both milk and in the seeds of leguminous plants.
Definition source: English Wiktionary via Wiktextract