Relating to, involving, or characterized by fusion or the act of joining two or more things together.
From fusion plus -al (relating to). Fusion derives from Latin fundere (to pour, merge).
Linguists use 'fusional language' to describe languages that mash word parts together so tightly you can barely tell where one part ends and another begins—like Latin compared to English!
Complete word intelligence in one call. Free tier — 50 lookups/day.