eiliiallisen
The term "eiliiallisen" appears to be a Finnish word. In Finnish, "eilisillallinen" translates to "yesterday's dinner" or "dinner from yesterday." It is a compound word formed from "eilen" (yesterday) and "illallinen" (dinner). The word itself is straightforward and describes a meal that was consumed on the preceding evening.
There is no specialized or technical meaning associated with "eiliiallisen" beyond its literal translation. It is