Kattoisten

Kattoisten is a Finnish grammatical form, specifically the genitive plural of the adjective kattoinen, which means “roofed” or “having a roof.” The word is formed from the noun katto (roof) plus the suffix -inen to create an adjective, and its plural genitive ending is -isten. Thus kattoisten is used to describe multiple roofed items in possessive or relational constructions.

In practical use, kattoisten appears in phrases such as kattoisten rakennusten suojelu, meaning “the protection of the roofed buildings,” or kattoisten talojen katot, meaning “the roofs of the roofed houses.” The form is common in descriptive writing, architectural descriptions, and linguistic explanations where the relationship between a group of objects and their shared characteristic (having a roof) is discussed.

Notes for learners: -inen adjectives in Finnish commonly take genitive plural -isten. The exact form changes across different cases and numbers, but kattoisten remains a standard example of this pattern. While kattoisten is primarily a grammatical inflection, it can appear in real-world texts whenever the writer emphasizes that several objects have roofs.

Related topics include the base noun katto (roof) and other -inen adjectives such as puinen (wooden) and kivinen (stone/rocky), which follow similar declension patterns in their genitive plurals.