IPA: /ˌmʌltiˈsɛljʊlər/
KK: /mʌltiˈsɛl.jʊ.lər/
Having or made up of many cells, typically referring to organisms that are composed of multiple cells rather than just one.
Humans are multicellular organisms that rely on the cooperation of many different types of cells.
Multicellular → It is formed from "multi-" (meaning many) and "cellula" (from Latin, meaning small room or cell). The word "multicellular" refers to an organism composed of many cells.
Think of 'many' ('multi-') small 'rooms' ('cellula') coming together to form a living organism.