IPA: /ˈmɒnəˌsɪləbəl/
KK: /ˈmɒnəˌsɪləbəl/
A word that has only one syllable.
The word 'cat' is a monosyllable.
Monosyllable → It is formed from "mono-" (from Greek "monos", meaning single or one) and "syllable" (from Greek "syllabē", meaning a part or a grouping of sounds). The word "monosyllable" refers to a word that consists of a single syllable.
Think of 'mono-' meaning 'one' and 'syllable' as a grouping of sounds — a monosyllable is simply a word made up of one sound group.