A Nordic dairy product, similar to yogurt, but using different bacteria which give a different taste and texture.
"When I met my fiancé's parents, he immediately introduced me as his fil to avoid any confusion about family roles."
Initialism of father-in-law.
Initialism of Federation of International Lacrosse.
"The referee announced that the match would be governed by FIL rules to ensure international compliance."
The word comes from the Swedish term fil, which originally meant a type of thickened milk product similar to yogurt. It is also related to the Finnish word viili.