fosiliseen
Fosiliseen is a Finnish illative form of the adjective fosilinen, meaning fossil-related or fossilized. The base adjective fosilinen describes things connected with fossils, fossilization, or characteristics resembling fossils. The form fosiliseen appears when the adjective modifies a noun in the illative case, used to express direction toward or into something, or in fixed expressions common in Finnish.
The word derives from the noun fossiili, meaning fossil, which in turn comes from the Latin fossilis.
In practice, fosiliseen and related forms appear in scientific discourse, particularly in geology, paleontology, and archaeology,
Overall, fosiliseen functions as a grammatical form within Finnish morphology to express relation to a noun