Pienhiirisiä

Pienhiirisiä is a Finnish word formed as the plural partitive of the adjective pienhiirinen, which literally means “mouse-sized” or “mouse-like.” The base is built from pien- meaning “small” and hiiri meaning “mouse,” with the common adjectival suffix -nen. In Finnish, adjectives agree with the nouns they modify in number and case, and the plural partitive pienhiirisiä is used to describe multiple nouns that are in the partitive case, such as pienhiirisiä olentoja (small, mouse-like beings) or pienhiirisiä elinympäristöjä (small, mouse-like habitats), depending on context.

Usage is relatively rare in everyday language. More common alternatives to convey a similar sense include hiiren kokoinen (mouse-sized) or hiirimäinen (mouse-like), especially in scientific or descriptive writing. Pienhiirinen as a base form and pienhiirisiä as its inflected plural partitive tend to appear in creative writing or folklore to evoke whimsy or diminutiveness, rather than in standard, formal prose.

Notes: The form is not widely attested in standard dictionaries; readers may encounter it mainly in literature or in author-coined descriptions. Because Finnish adjectives are productive and many speakers prefer periphrastic constructions for size or shape, pienhiirisiä is best understood as a descriptive option rather than a common everyday term.

See also: hiiri, kokoinen, pienhiirinen, Finnish adjective declension, partitive case.