Wiktionary
multicelled
a. (context of an organism English) Having many cells; multicellular
Usage examples of "multicelled".
Man in the Moon is in fact a record of ancient catastrophes, most of which took place before humans, before mammals, before vertebrates, before multicelled organisms, and probably even before life arose on Earth.
Flowering plants are late products of the evolution of multicelled photosynthesizers.
He stares at these with awe and reverence: they are the first multicelled extraterrestrial beings ever discovered, though he suspects and hopes that they will not be the last.