polysynthesism

[ pol-i-sin-thuh-siz-uh m ]
/ ˌpɒl ɪˈsɪn θəˌsɪz əm /

noun

the synthesis of various elements.
the combining of several words of a sentence into one word.

Origin of polysynthesism

First recorded in 1880–85; poly- + synthes(is) + -ism