This is the 867th most frequent Finnish word.
lajin
The Finnish word "lajin" means "of the species" or "of the kind" (genitive form of "laji").
Here, 'lajin' means 'of a species,' indicating possession or relation to a specific bird species.
Tämä on harvinaisen linnun lajin pesä.
This is the nest of a rare bird species.
In this case, 'lajin' refers to 'a type of sport,' specifying the kind or category.
Hän aloitti harjoittelun uuden urheilulajin parissa.
They began training in a new sport.
Here, 'lajin' refers to a species, showing its genitive form to specify a category or type belonging to the species.