Where does “tietosanakirjallinen” come from?

tietosanakirjallinen (Finnish) comes from Finnish tietosanakirja, from Finnish sanakirja, from Swedish ordbok, from Swedish ord, from Old Swedish orþ, from Old Norse orð, from Proto-Germanic wurdą, from Proto-Indo-European werdʰo- — to speak, say.

tietosanakirjallinen (Finnish): encyclopedic