hapoista

Hapoista is the elative plural form of the Finnish noun happo, meaning “from acids” or “acid-derived.” In Finnish grammar, the elative case expresses origin or source and is formed with the suffix -sta or -stä. Therefore haposta is the singular elative form and hapoista is the plural elative form. The word appears mainly in technical or scientific writing, particularly chemistry, where it describes substances or derivatives that originate from acids.

In use, hapoista functions as part of a noun phrase indicating origin. A common construction is hapoista peräisin olevat yhdisteet, meaning “compounds derived from acids.” Because it signals origin from acids, the term is most frequent when discussing multiple acids or speaking in general about acids as a class. In everyday Finnish, the form is less common and speakers may prefer to specify the particular acid or rephrase the idea more directly.

Grammatically, happo- forms the stem for related inflections, with the elative plural suffix -ista attaching to yield hapoista. The singular elative is haposta, and the nominative plural of happo is hapot, while the related compound forms can be built from these bases as needed.

Related terms include happo (acid), hapot (acids, nominative plural), and the elative suffix -sta/-stä used to indicate origin in Finnish.

See also: happo; hapot; elatiivi (elative) suffix -sta/-stä.