Rostlinnou

Rostlinnou is the instrumental singular feminine form of the Czech adjective rostlinný, meaning plant-related or botanical. It is used when the adjective modifies a feminine noun in the instrumental case, for example in phrases describing means, manner, or basis that involve plants.

Etymology and morphology: The form derives from the noun rostlina (plant) and the related adjective rostlinný. In the feminine singular, the nominative form is rostlinná, and the instrumental singular commonly appears as rostlinou or rostlinnou depending on the specific noun and phonetic context. In standard written Czech, rostlinnou marks the instrumental case and agrees in gender with feminine nouns.

Usage: Rostlinnou is most often found in formal or technical contexts such as nutrition, ecology, and botany, where plant-based or plant-derived characteristics are described as a means or basis. It typically accompanies feminine nouns in instrumental construction, for example with phrases like rostlinnou stravou (plant-based diet) or rostlinnou výživou (plant-based nourishment). The form signals that plants or plant-derived elements serve as the instrument, basis, or manner of action.

Notes: Rostlinnou is a grammatical form rather than a lexical item with independent meaning. Its correct use depends on the gender and case of the noun it modifies. In everyday speech, speakers may prefer shorter expressions or different constructions, but rostlinnou remains standard in formal Czech when the instrumental feminine is required.

See also: rostlinný, rostlina, rostlinná říše.