Something that's multicellular is a complex organism, made up of many cells. Humans are multicellular.

While single-celled organisms can't usually be seen without a microscope, you can see most multicelluar organisms with the naked eye. Plants and animals are multicellular — although they all, including humans, start as a single cell that reproduces into many. Multi means "many," and the Latin root of cellular is cellularis, "of little cells," from cella, "small room."

Definitions of multicellular
  1. adjective
    consisting of many cells
    multicellular organisms”
    characterized by or divided into or containing cells or compartments (the smallest organizational or structural unit of an organism or organization)
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