pírodními

Přírodními is the instrumental plural form of the Czech adjective přírodní, meaning natural. It is used to modify nouns in the instrumental case and describes something related to nature or occurring in nature.

In usage, this form appears in phrases that indicate being accompanied by or related to natural aspects. Common contexts include çev phraseology in environmental science, geography, and natural history. Examples include přírodními jevy (natural phenomena) and přírodními zdroji (natural resources). The form is also found in discussions of natural sciences, ecology, and related fields, where natural characteristics or processes are contrasted with artificial ones.

Etymology and spelling notes: the adjective přírodní is derived from příroda, meaning nature. The standard spelling uses the háček on the ř and í, yielding přírodními in the instrumental plural. A closely related form is used across genders and noun classes in plural instrumental contexts, such as with masculine, feminine, and neuter nouns when describing natural characteristics or phenomena. The sequence is part of normal Czech declension and follows common patterns for adjectives ending in -ní.

In practice, the correct form is přírodními. A variant without the háček, pírodními, is not correct in standard Czech and likely represents a typographical error or nonstandard usage.