Litroihin

Litroihin is the illative plural form of the Finnish noun litra, meaning liter. In Finnish grammar, the illative case indicates movement toward or into something, and the plural form marks multiple units or a quantity. Therefore litroihin roughly translates as into liters or toward the amount measured in liters, and it is used when referring to several liters or a quantity defined in liters.

The base noun litra denotes a liter, a standard unit of volume in the metric system. Litroihin is formed by taking the stem litra- and adding the illative plural suffix, producing litroihin in accordance with Finnish phonology and morphology.

Etymology-wise, litra/litra is a borrowed term meaning liter, linked to the international unit name lit(er) or litre. The Finnish form litra reflects this borrowing, while litroihin shows the regular Finnish way of forming plural illative phrases for quantities expressed in liters.

Usage notes: this form is relatively specialized and most commonly found in technical, logistical, or scientific texts dealing with volumes. In everyday Finnish, speakers may opt for other constructions when referring to a quantity of liters, depending on the context.